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Bio of algae
Algae fun
231
Biology
Undergraduate 3
02/10/2010

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Term
Acrokont
Definition
anteriorly inserted flagella
Term
Acronematic
Definition
simple or whiplash flagella
Term
Agar
Definition
a sulfated polygalactan extracted from the walls of various red algae that is used as a gelling agent
Term
Akinete
Definition
a thick-walled spore that functions in asexual reproduction, frequently serving as a resistant stage that undergoes a period of dormancy... i.e. a "resting" spore that formed from a thicker cell wall and higher carbohydrate concentrations
Term
Alga
Definition
thallophytes with chlorophyll
Term
Alginates
Definition
derived from brown algae and used in many food products; thickens beer and gives it foam; also used in teeth molds
Term
Allophycocyanin
Definition
the blue pigment in cyanobacteria; a type of phycobillin produced by cyanobacteria (except in Chlorophyll a and b producers)
Term
Androgonidia
Definition
specialized somatic cells and asexual reproductive cells within Volvox
Term
Anisogamy
Definition
a type of sexual reproduction characterized by two gametes that differ in size, but are identical in morphology
Term
Antheridia
Definition
a haploid structure or organ that produces and contains male gametes
Term
Antherozoid
Definition
male gametes produced within an antheridium
Term
Apical Cap
Definition
formed after the incomplete cytokinesis in oedogoniales to separate the two daughter cells
Term
Aplanospore
Definition
a nonflagellated spore that has the genetic potential to produce flagella under appropriate conditions (by the subdivision of a parental cell)
Term
Autocolony
Definition
a type of asexual reproductive colony that is a miniature of the adult colony; produced by single cells of the adult colony
Term
Autospore
Definition
a nonflagellated spore that lacks the genetic potential to produce flagella
Term
Axile-plastid
Definition
chloroplasts located at the center of the cell
Term
BMAA
Definition
a cyanotoxin produced in small amounts by cyanobacteria that has been linked to brain destruction
Term
Basal bodies
Definition
the bases of flagella; located inside the cell
Term
Beta-granules
Definition
granules located within the chromatoplasm or centroplasm of cyanobacteria
Term
Bilenticular
Definition
pyrenoid divided vertically in half
Term
Biological species concept
Definition
If two algal taxa can be demonstrated to interbreed and have viable offspring, then they belong to the same species. If interbreeeding does not occur, they are regarded as two separate species.
Term
Biomagnification
Definition
the increase of the concentration of a substance as you go up the food chain
Term
Bootstrap
Definition
an estimate of the validity of a branch in a phylogenetic tree that is determined by the number of times the branch appears after the data are repeatedly resampled
Term
CCW
Definition
position of flagella when the basal bodies shift in the counter-clockwise direction
Term
CW
Definition
position of flagella when the basal bodies shift in the clockwise direction
Term
Carboxysomes
Definition
structure within the cells of cyanobacteria that contains the enzymes rubisco and carbonic anhydrase used in carbon fixation
Term
Carotenes
Definition
type of carotenoid; hydrocarbons with a chain of long double bonds and one or two cyclic endings
Term
Carotenoids
Definition
yellow and orange pigments soluble in organic solvents and lipids
Term
Carrageenans
Definition
mucilaginous sulfated polygalactans in the cell walls of red algae that are extracted for use as gelling agents in the food industry
Term
Cellulose
Definition
substance that makes up the chlorophytan cell wall
Term
Centroplasm
Definition
granular and colorless area of cyanobacteria where DNA is located without a nuclear membrane
Term
Chlorophyll
Definition
green pigments soluble in alcohol and organic solvents- 4 types: a,b,c and d
Term
Chromatic adaptation
Definition
the ability of algae to modify the amounts or proportions of photosynthetic pigments in relation to changes in the environment
Term
Chromatoplasm
Definition
peripheral area of cyanobacteria where the pigments for photosynthesis are located; it is blue-green in color
Term
Cladogram
Definition
a phylogenetic tree formed through the parsimonious method
Term
Classification
Definition
the grouping and ranking of algae
phyla= -phyta
class= -phyceae
order= -ales
family= -aceae
species= no specific ending
Term
Closed mitosis
Definition
mitosis that occurs with an intact nuclear envelope
Term
Coccoid
Definition
morphology of unicellular algae that have cell walls and no flagella
Term
Codiolum stage
Definition
a thick-walled sac or club shaped unicellular life-history phase (found in Ulotrichiales), attached to substrates by a stalk
Term
Coenobium
Definition
a type of protist colony whose shape and cell number is genetically determined, established early in development, and doesn't change during the life of the organism
ex: an autocolony
Term
Coenocytic
Definition
algal thallus with a multi-nucleated siphon and no transverse walls
Term
Colony
Definition
a group of cells held together by mucilage or cell wall material
Term
Conjugation
Definition
sexual reproduction between cells which have become joined or "yoked" together, the gametes becoming united through a tube or opening at the point of junction
Term
Cosmopolitan
Definition
algae that can grow at any height
Term
Crown-cells
Definition
cells at the top of the nucule (female reproductive structure) in Charales. In the chara species there are 5, while nutella 10
Term
Crtpoendolithic
Definition
algae hidden inside rocks
Term
Cyanophage
Definition
a virus that affects cyanobacteria by injecting their material in the host cell and replicating within
*How BMAA grew in Nostoc
Term
Cyanophicin
Definition
nitrogen granules within the chromatoplasm of cyanobacteria
Term
Cyanotoxin
Definition
poisons produced by cyanobacteria
Term
Cysts
Definition
where/how the gametes of Dasycladales form
Term
Cytokinesis
Definition
cell division
Term
DO
Definition
the most primitive form of flagella in which the basal bodies of the flagella are facing each other
Term
Dendrogram
Definition
a phylogenetic tree formed through the distance method
Term
Dioecious
Definition
heterothallic (self-sterile) gametes that contain only one type of sex cell
Term
Diploid
Definition
a cell or organism with 2 sets of chromosomes; usually one from the mother and one from the father
Term
Dwarf-male
Definition
a minute male plant, smaller than the female, as in the Oedogoniaceae, growing on or near the female sex organ
Term
Egg
Definition
female sex cell or gamete
Term
Endospore
Definition
asexual reproduction in cyanobacteria characterized by multiple divisions within the cell and new cells breaking through the parental cell wall
Term
Endosymbiosis
Definition
the origin of eukaryotic cells through heterotrophic cells, which alread had nuclear envelopes and other organelles, acquired chloroplasts by encorporating cyanobacteria as endosymbionts
Term
Epilithic
Definition
algae that lives or grows on rocks
Term
Epiphytic
Definition
algae that lives or grows on plants
Term
Epizoic
Definition
algae that lives or grows on animals
Term
Eukaryote
Definition
an organism whose cells contain complex structures (membrane- bound organelles)
Term
Exhaustive search
Definition
when every possible phylogenetic tree is analyzed and the number or taxa is less than 12
Term
Exospore
Definition
asexual reproductive in cyanobacteria with successive divisions outside one end of the cell (as a bud)
Term
Eyespot
Definition
a red colored spot found in Volvocales, made of lipids and carotenoids, involoved in the perception of light
Term
Faint-Young Sun
Definition
theory that during Earth's younger years, CO2 concentrations were high, atmospheric pressure was high, and the concentrations of methan were high. At the first glaciation period, cyanobacteria formed, which converted CO2 to O2. With the presence of cyanobacteria, CO2 decreased, O2 increased, atmospheric pressure decreased, while sunlight, greenhouse gases, and volcanic activity increased, leading to the diversity of Earth.
Term
Female gamete
Definition
egg or ovum
Term
Fertilization
Definition
the joining of male and female gametes to produce a zygote
Term
Filament
Definition
a thread of cells; one or more rows of cells in liear arrangement
Term
Fragmentation
Definition
asexual reproduction that involves breaking of filaments by the dying of a necridium to produce a hormogonium which in turn produces another filament outside the cell
Term
Furrowing
Definition
the most primitive form of cytokinesis in which the cell divides by infurrowing on itself
Term
Gameteogenesis
Definition
the process by which diploid or haploid cells undergo cell division to form mature gametes
Term
Gametic-meiosis
Definition
meiosis occurring during the production of gametes
Term
Gametophyte
Definition
a haploid multicellular structure, or phase, containing a single set of chromosomes that will produce a gamete
Term
Gas vesicles
Definition
in cyanobacteria cells, cylindrical structures whose protein walls are permeable only to gases and increase the bouyancy of the cells
Term
Geminate
Definition
to double
Term
Gene-loss
Definition
the loss of nucleotides that code to make a certain gene, leadin to the loss of a structure or function
Term
Gene-substitution
Definition
redundant genes due to the addition of a nucleotide
Term
Gene-transfer
Definition
the alteration of a genetic code by the movement of nucleotides
Term
Genomics
Definition
the application of techniques for the study of an organism's entire genome, though research may focus on nuclear, plastid, or mitochondrial DNA sequence information
Term
Glaucophytes
Definition
an informal name for a group of eukaryotic algae capable of producing flagella, which have plastids whose envelope is composed of two membranes and which contain phycobilin pigments in phycobilisomes
Term
Globules
Definition
Charales male reproductive structures, usually orange in color
Term
Glycogen
Definition
a starchlike storage product in cyanobacteria
Term
Gonidia
Definition
both male and female gametes; male gonidia (androgonidia) form sperm packets (sperm gametes) and female gonidia become oogonia, the female gametes
Term
Grana
Definition
one of the lamellar stacks of chlorophyll-containing material in plant chloroplasts
Term
Gyragonites
Definition
calcified female structure in charales found as a fossil
Term
HAB (Harmful Algal Blooms)
Definition
an algal bloom that causes negative impacts to other organisms via production of natural toxins, mechanical damage to other organisms, or by other means
Term
Haploid
Definition
a cell or organism with only one set of chromosomes
Term
Hemicellulose
Definition
Any of several polysaccharides that are more complex than a sugar and less complex than cellulose, found in plant cell walls
Term
Hepatoxins
Definition
cyclin peptide polymers found in some cyanobacteria and eukaryotic algae that inhibit protein phosphatases
Term
Heterocyst
Definition
in cyanobacteria, a thick-walled, weakly pigmented cell within the trichome that is of different size than the other vegetative cells, and has a plug of mucilage at each end of the cell, and is the site of nitrogen fixation
Term
Heterogamy
Definition
sexual reproduction of clearly distinct gametes (heteromorphic gametes)
Term
Heteromorphic
Definition
morphologically different algae, i.e. the male and female gametes are of different size and or morphology
Term
Heteroplastids
Definition
in Ulvophycean algae, having two kinds of plastids- green chloroplasts and colorless, starch storing amyloplasts (leucoplasts)
Term
Heterothallic
Definition
a self sterile organism, requiring two different clones for sexual reproduction; self-incompatible
Term
Heterotrichous
Definition
having a filamentous body consisting of both an erect and a flat prostrate (attached) stem
Term
Heuristic search
Definition
a trial and error approach to tree phylogeny when the number of taxa is more than twelve
Term
Histones
Definition
strongly alkaline proteins found in eukaryotic cell nuclei, which package and order the DNA into structural units called nucleosomes
Term
Holotype
Definition
a single physical example of an organism, known to have been used when the species was formally described; the individual believed to have begun a species
Term
Homothallic
Definition
a self-fertile organism that requires on one clone for sexual reproduction; self-compatible
Term
Hormogonium
Definition
in filamentous cyanobacteria, a few-celled, usually motile filament that functions in asexual reproduction, dispersal and on some cases, colonization of a host
Term
Hydrophillic
Definition
chains found within the aqueous matrix of a plant or alga
Term
Hydrophobic
Definition
chains buried withing the membrane of a structure (thylakoid membrane for algae)
Term
Hypnozygote
Definition
a thick-walled, resting zygote that may germinate in favorable conditiong following a required period of dormancy
Term
ITS (internal transcribed spacer)
Definition
section of rRNA that is highly variable and therefore the least constant throughout a species
Term
Identification
Definition
the process of determining the class or family to which a newly discovered alga belongs
Term
Internode
Definition
the space or section of a filament or of a thallus between nodes or joints, which often bear branches
Term
Inversion
Definition
A turning inward or inside out, as in embryogenesis of sponges; also, reversal in order of genes or reversal of a chromosome segment
Term
Isogamy
Definition
sexual reproduction involving gametes who are not morphologically distinguishable... i.e. identical gametes
Term
Isokont
Definition
flagella of equal length on an organism and usually of the same morphology
Term
Isomorphic
Definition
sexual reproduction in which there are at least two multi-cellular stages that are morphologically similar
Term
Isthmus
Definition
the area that unites the two semi-cells of Desmidales
Term
Karyokinesis
Definition
nuclear division
Term
LSU (large subunit)
Definition
a section of ribosomal RNA that is the least variable anf therefore the most constant throughout a species
Term
Lateral-conjugation
Definition
sexual reproduction in which two cells of the same filament become interconnected by a passage way (tube) around the cross wall permitting the union of the cell contents of the acting gametangia to unite and form a zoospore
Term
Lectotype
Definition
a biological specimen or illustration later selected to serve as definitive type example of a species or subspecies when the original author of the name did not designate a holotype
Term
Lichens
Definition
stable, self-supporting associations between fungi and cyanobacteria
Term
Macrandrous
Definition
Oedogoniales' life cycle characterized by zygotic meiosis and similar sized male and female filaments
Term
Male Gamete
Definition
sperm
Term
Maximum Parsimony
Definition
Under maximum parsimony, the preferred phylogenetic tree is the tree that requires the smallest number of evolutionary changes.
Term
Meiosis
Definition
 cell division that produces reproductive cells in sexually reproducing organisms
Term
Meristem
Definition
zone of active cell division in a plant usually at the stem or root
Term
Metacentric Spindle
Definition
A spindle separating a chromosome with arms of relatively equal length
Term
Microchip
Definition
A microchip implant is an identifying integrated circuit placed under the skin of a dog, cat, horse, or other animal
Term
Microtubular Roots
Definition
Any of the proteinaceous cylindrical hollow structures that are distributed throughout the cytoplasm of eukaryotic cells, providing structural support and assisting in cellular locomotion and transport.
Term
Molecular Phylogenetics
Definition
s the use of the structure of molecules to gain information on an organism's evolutionary relationships. The result of a molecular phylogenetic analysis is expressed in a phylogenetic tree.
Term
Monadoid
Definition
flagellated vegetative cells (Chlamydomonas)
Term
Monoecious
Definition
an individual with both male and female reproductive parts
Term
Monophyletic
Definition
a clade containing one ancestor, all its descendants, and only its descendants.
Term
Multinucleate
Definition
(also multinucleated, coenocytic) cells have more than one nucleus per cell, which is the result of nuclear division not being followed by cytokinesis.
Term
Multiseriate
Definition
composed of more than one cell layer
Term
Mycobiont
Definition
The fungal component of a lichen, commonly an ascomycete
Term
Nannandrous
Definition
Pertaining to species of plants in which male members are markedly smaller than females, such as in some algal species of Oedogonium that have antheridia produced in special dwarf filaments.
Term
Necridium
Definition
A dead cell: a cell in the trichome of the Oscillatoriales which dries, becomes filled with mucilage, and so forms a weak link, providing for fragmentation.
Term
Neurotoxin
Definition
a toxin that acts specifically on nerve cells[1] (neurons), usually by interacting with membrane proteins such as ion channels.
Term
Nitrogenase
Definition
is the enzyme used by some organisms to fix atmospheric nitrogen gas (N2). It is the only known family of enzymes which accomplishes this process.
Term
Node
Definition
part of thallus that bears branches
Term
Nomenclature
Definition
the system of naming algae, on a first to identify basis
Term
Non-monophyletic
Definition
a clade containing or coming from more than one ancestor
Term
Nucule
Definition
female sex organs in charales
Term
Oxygenic photosynthesis
Definition
photosynthesis in cyanobacteria and algae the produces oxygen
Term
Systematics
Definition
the study of the diversification of life on the planet Earth, both past and present, and the relationships among living things through time.
Term
oogamy
Definition
It is a form of anisogamy (heterogamy) in which the female gamete (e.g. egg cell) is significantly larger than the male gamete and is non-motile.
Term
oogonium
Definition
A female ancestral germ cell that divides several times to give rise to an oocyte that, in turn, develops into an egg
Term
open-mitosis
Definition
the nuclear envelope breaks down and then re-forms around the two sets of separated chromosomes.
Term
organelle
Definition
is a specialized subunit within a cell that has a specific function, and is usually separately enclosed within its own lipid bilayer.
Term
oscillation
Definition
repetitive variation around a central point (im guessing in algae this refers to the flagella)
Term
palmelloid
Definition
Pertaining to a colony of cells that aggregates in a gelatinous matrix, as is characteristic of blue-green algae.
Term
parallel basal body
Definition
an organelle formed from a centriole, and a short cylindrical array of microtubules that is straight across from one another
Term
parenchyma
Definition
the functional parts of an organ in the body; also, a form of body in which true tissues are produced
Term
parietal
Definition
cells or chloroplasts lining the outside of the wall
Term
parthenogenesis
Definition
form of asexual reproduction found in females, where growth and development of embryos occurs without fertilization by a male.
Term
pectin
Definition
is a structural heteropolysaccharide contained in the primary cell walls of terrestrial plants; used as gelling agent in food
Term
peptidoglycan
Definition
a polymer that forms a mesh-like crystal lattice layer outside the plasma membrane of bacteria, forming the cell wall.
Term
phialospore
Definition
spores from phialides on fungi
Term
phototaxis
Definition
a kind of behavioral response (positive or negative) that occurs when a whole organism moves in response to the stimulus light.
Term
phragmoplast
Definition
a plant cell specific structure that forms during late cytokinesis and basically forms the mitotic spindle between the daughter nuclei
Term
phycobilin
Definition
help absorb light for photosynthesis, the light range or spectrum is different for every organism
ex. red algae absorb more blue and reflect red
Term
phycobilisome
Definition
light harvesting antennae of photosystem II in cyanobacteria, red algae and glaucophytes.
Term
phycobiont
Definition
the symbiotic algal or bacterial constituent of a lichen.
Term
phycocolloid
Definition
The cell walls of many seaweeds contain phycocolloids (algal colloids) that can be extracted by hot water; gelatinous chemical produced by seaweeds
Term
phycocyanin
Definition
is a pigment that absorbs red and orange light from the light-harvesting phycobiliprotein family in cyanobacteria
Term
phycoerythrin
Definition
is a red protein from the light-harvesting phycobiliprotein family, present in cyanobacteria, red algae and cryptomonads that absorbs blue green pigment and reflect red yellow
Term
phycology
Definition
the study of algae
Term
phycoplast
Definition
a microtubule structure observed during cytokinesis in members of the Chlorophyceae, the largest class of green algae.
Term
phykos
Definition
greek for seaweed
Term
phylogenetic reconstruction
Definition
reconstructing and changing around the tree of life from the knowledge of the phylogenetic relations among species
Term
phylogenetic species concept
Definition
The view that a species should be defined only by its diagnosibility; i.e. that it consists of a population with a unique set of features
Term
phylogenomics
Definition
refer to some type of analysis involving genome data and evolutionary reconstructions, especially phylogenetics.
Term
phylogeny
Definition
the history of organismal lineages as they change through time and the idea that all organisms are connected through genes
Term
phytol
Definition
an extremely common terpenoid, found in all plants esterified to Chlorophyll to confer lipid solubility
Term
phytoplankton
Definition
the autotrophic component of the plankton community; microscopic plants that live in the ocean
Term
placcoderm-desmid
Definition
cells divided into two mirror-image semi-cells, joined by a narrow isthmus; wall contain pores for the secretion of mucus
Term
plesiomorphic
Definition
describes primitive or generalized characteristics that arose early in the evolutionary history of a taxonomic group
Term
pleuronematic
Definition
flagellum bearing hair-like appendages
Term
polarity
Definition
describes how equally bonding electrons are shared between atoms
Term
primary endosymbiosis
Definition
incorporation of a free living prokaryote into a host eukaryotic cell, with subsequent information into an organelle
Term
prochloron
Definition
a unicellular marine organism
Term
prokaryote
Definition
group of organisms that lack a cell nucleus or any other membrane-bound organelles
Term
protothecosis
Definition
an infectious disease by a type of green alga that lacks chlorophyll
Term
pseudobranching
Definition
In filamentous algae, a break in the filament with 1 or both ends projecting from the sheath, giving the appearance of branching.
Term
pseudoparenchyma
Definition
a form of algal body composed of interwoven, continuous filaments; superficially resembles parenchyma (a form of body in which true tissues are produced)
Term
pyrenoid
Definition
centers of carbon dioxide fixation within the chloroplasts of algae and hornworts. They are not membrane-bound organelles, but specialized areas of the plastid that contain high levels of rubisco
Term
radial
Definition
Radiating from or converging to a common center.
Term
rbcL (rubisco)
Definition
large subunit rubisco- useful to identify more recent divergence events at species levels
Term
red tide
Definition
increase or accumulation in the population of algae in an aquatic system that tints the water red or brown
Term
reticulated
Definition
Resembling or forming a net or network
Term
rhizoid
Definition
a structure in plants, fungi and some other organisms (e.g. some sponges) that functions like a root in support or absorption.
Term
rna
Definition
a biologically important type of molecule that consists of a long chain of nucleotide units.
Term
rotation
Definition
a movement of an object in a circular motion
Term
ssu (small subunit)
Definition
rrna that allows us to research the divergence of species over millions of years (ssu is less variable with some high varying sections)
Term
saccoderm desmid
Definition
Desmids with a homogeneous cell wall that lacks pores; are not differentiated into two semi-cells
Term
scalariform- conjugation
Definition
Conjugation (sexual reproduction involving nonflagellate gametes) involving two filaments that allign laterally and form conjugation tubes between adjacent cells in a ladder-like arrangement
Term
secondary endosymbiosis
Definition
occurs when the product of primary endosymbiosis is itself engulfed and retained by another free living eukaryote
Term
semicell
Definition
in desmids, the nucleus divides and near the isthmus two new semi-cells are formed. semi cells are basically half cells.
Term
sheath
Definition
protective covering
Term
siphonaceous
Definition
relating to green algae that are tubular, multinucleate and not divided into cells by cross walls
Term
snowball earth
Definition
refers to the hypothesis that the Earth's surface became nearly or entirely frozen over at least once during three periods between 650 and 750 million years ago.
Term
sperm packet
Definition
a capsule of sperm deposited and later picked up by a female
Term
sporic meiosis
Definition
features of spore-producing multicellular sporophytes and gamete-producing multicellular gametophytes. Diagramatically, sporic meiosis looks like the complex halves of and are merged into one.
Term
sporogenesis
Definition
Production or formation of spores. Reproduction by means of spores
Term
sporophyte
Definition
in certain plants and algae, the spore-bearing generation that is diploid and reproduces by spores: the sporophyte generation begins with the fertilized egg and ends with meiosis
distinguished from gametophyte
Term
starch
Definition
produced in green plants as an energy store
Term
stephanokont
Definition
A cell that has a ring of flagella or cilia near one end that looks like a crown
Term
stolons
Definition
specialized type of horizontal above-ground shoot, a colonizing organ that arises from an axillary bud near the base of the plant
Term
stromatolites
Definition
are layered structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria
Term
subaerial
Definition
Growing on or near the earth's surface
Term
tandem repeats
Definition
occur in DNA when a pattern of two or more nucleotides is repeated and the repetitions are directly adjacent to each other
Term
taxonomy
Definition
the practice and science of classification
Term
topotype
Definition
a specimen from the locality at which the type was first collected
Term
tetrapyrrol
Definition
a chemical group consisting of four pyrrole rings joined either in a straight chain (as in phycobilins) or in a ring
Term
tertiary endosymbiosis
Definition
involving the engulfment of a secondary endosymbiont
Term
thallophyte
Definition
a polyphyletic group of non-mobile organisms traditionally described as "relatively simple plants" with undifferentiated bodies (thalli).
Term
thallus
Definition
meaning a green shoot or twig, is an undifferentiated vegetative tissue of some non-mobile organisms, many of which were previously known as the thallophytes.
Term
thermophilic
Definition
liking areas of hot temperatures- thermophile
Term
thylakoid
Definition
a membrane-bound compartment inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis.
Term
transduction
Definition
process by which DNA is transferred from one bacterium to another by a virus.
Term
transformation
Definition
the genetic alteration of a cell resulting from the uptake, genomic incorporation, and expression of foreign genetic material
Term
trichome
Definition
are fine outgrowths or appendages on plants and certain protists. (hair)
Term
true branching
Definition
If a filament has true branching the intercellular fluids will flow freely throughout all the branches of the filament.
Term
ubiquitous
Definition
being widely present; present everywhere at once
Term
umbilicate
Definition
Having a central mark or depression resembling a navel
Term
unicellular
Definition
having or consisting of one cell
Term
uninucleate
Definition
having one nucleus
Term
uniseriate
Definition
composed of a single row of cells
Term
xanthophyll
Definition
are yellow pigments from the carotenoid group
Term
zonate
Definition
marked with zones; belted, striped, or ringed
Term
zoospore
Definition
a motile asexual spore that uses a flagellum for locomotion
Term
zygote
Definition
the initial cell formed when a new organism is produced by means of sexual reproduction. A zygote is synthesized from the union of two gametes, and constitutes the first stage in a unique organism's development
Term
zygotic meiosis
Definition
If meiosis occurs in the diploid zygote, then the product of meiosis will be a free-living plant which is haploid. This type of life cycle is said to be zygotic, or haplontic, indicating that the free-living plant is haploid.
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