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AB130
Exam 2 - Ch. 28, 29, and 30
87
Biology
Undergraduate 1
04/22/2010

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Term
protists
Definition
informal term applied to any eukaryote that is not a plant, animal, or fungus; most are unicellular though some are colonial or multicellular
Term
mixotrophs
Definition
organism that is capable of both photsynthesis and heterotrophy
Term
secondary endosymbiosis
Definition
process in eukaryotic evolution in which a hetrotropyhic eukaryotic cell engulfed a photsynthetic eukartyotic cell, which survied in a symbiotic relationship inside the hetrotrophic cell
Term
excavata
Definition
one of the five supergroups of eukaryotes proposed in a current hypothesis of the evolution history of eukaryotes; have unique cytoskeletal fatures, ans oem species have an excavated feeing groove on one side othe cell body
Term
diplomonads
Definition
protists that has modified mitochondria, two equal-sized nuclei, and multiple flagella
Term
parabasalids
Definition
protists, such as a trichomonad, with modified mitochondria
Term
euglenozoans
Definition
member of a diverse clade of flagellated protists that includes predatory heterotrophs, photosynthetic autotrophs, and pathogenic parasites
Term
kinetoplastids
Definition
protist, such as a trypanosome, that has a single large mitochondiron that houses extranuclear DNA
Term
euglenid
Definition
protist, such as Euglena or its derivatives, characterized by an anterior pocket from which one or two flagella emerge
Term
chromalveolata
Definition
one of five supergroups of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes; may have originated by secondary endosymbiosis and include two large protist clades, the aleolates and the stramenopiles
Term
alveolates
Definition
protists with membrane-bounded sacs (alveoli) located just under the plasma membrane
Term
apicomplexans
Definition
protists in a clade that includes many species that parsitize animals; some cause human disease
Term
stramenopiles
Definition
protists in which a "hairy" flagellum (covered with fine, hairlike projections) is paired with a shorter, smoother flagellum
Term
golden algae
Definition
biflagellated, photosynthetic protist named for its color, which results from its yellow and brown carotenoids
Term
brown algae
Definition
multicellular, photosynthetic protist with a characteristic brown or olive color that results from carotenoids in its plastids; most are marine, some have plantlike body
Term
thallus
Definition
seaweed body that is plantlike, consisting of a holdfast, stipe and blades, yet lacks true roots, stems, and leaves
Term
holdfast
Definition
rootlike structure that anchors a seaweed
Term
stipe
Definition
stemlike structure of a seaweed
Term
blades
Definition
leaflike structure of a seaweed that provides most of the surface area for photosynthesis
Term
heteromorphic
Definition
referring to a condition in the life cycle of plants and certain algae in which the sporophyte and gametophyte generations differ in morphology
Term
isomorphic
Definition
referring to alternating generations in plants and certain algae in which the sporophytes and gametophytes look alike, although they differ in chromosome number
Term
oomycetes
Definition
protist with flagellated cells (i.e. water mold, white rust, or downy mildew) that acquires nutrition mainly as decomposer or plant parasite
Term
rhizaria
Definition
one of five supergroup of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes; morphologically diverse protist clade that is defined by DNA similarities
Term
pseudopodia
Definition
cellular extension of amoeboid cells used in moving and feeding
Term
foraminiferans (forams)
Definition
aquatic protist that secretes hardened shell containing calcium carbonate and extends pseudopodia through pores in the shell
Term
radiolarians
Definition
protist, usually marine, with a shell generally made of silica and pseudopodia that radiate from the central body
Term
archaeplastida
Definition
one of five supergroups of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes; monophyletic group, includes red algae, green algae, and land plants, descnded form an ancient protist that engulfed a cyanobacterium
Term
red algae
Definition
photosynthetic protist, named for its color, which results from a red pigment that masks the green of chlorophyll; most are multicllular and marine
Term
green algae
Definition
photosynthetic protist, named for green chloroplasts that are similar in structure and pigment composition to those of land plants; paraphyletic group , some are more closely related to land plants than they are to other green agla
Term
unikonta
Definition
one of five supergroups of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes; supported by myosin proteins and some DNA studies, consists of amoebozoans and opisthokonts
Term
amoebozoans
Definition
protist in a clade that includes many species with lobe- or tube-shaped pseudopodia
Term
plasmodial slime molds
Definition
type of protist that has amoeboid cells, flagellated cells, and a plasmodial feeding stage in its life cycle
Term
plasmodium
Definition
single mass of cytoplasm containg many diploid nuclei that forms during the life cycle of some slime molds
Term
cellular slime molds
Definition
type of protist htat has unicellular amoeboid cells and aggregated reproductive bodies in its life cycle
Term
opisthokonts
Definition
member of the clade, Opisthokonta, organisms that descended from an ancestor with posterior flagellum, including fungi, animals, and certain protists
Term
producers
Definition
organism that produces organic compounds from CO2 by harnessing light energy or by oxidizing inorganic chemicals
Term
phragmoplast
Definition
alignment of cytoskeletal elements and Golgi-derived vesicles that forms across the midline of a dividing plant cell
Term
placental transfer cells
Definition
plant cell that enhances the transfer of nutrients from parent to embryo
Term
embryophytes
Definition
alternate name for land plants that refers to their shared derived trait of multicellular, dependent embryos
Term
sporangia
Definition
multicellular organ in fungi and plants in which meiosis occurs and haploid cells develop
Term
sporocytes
Definition
diploid cell, also known as a spore mother cell, that undergoes meiosis and generates haploid spores
Term
gametangia
Definition
multicellular plant structure in which gametes are formed
Term
archegonia
Definition
female version of gametangia
Term
antheridia
Definition
male version of gametangia
Term
apical meristems
Definition
embryonice plant tissue in the tips of roots and the buds of shoots; dividing cells of which enable the plant to grow in length
Term
lycophytes
Definition
informal name for a member of the phylum lycophyta, which includes club mosses, spike mosses, and quillworts
Term
grade
Definition
group of organisms that share the same level of organization complexity or share a key adaptation
Term
hornworts
Definition
small, herbaceous nonvascular plant that is a member of the phylum Anthocerophyta
Term
mosses
Definition
small, herbaceous nonvascular plant that is a member of the phylum Bryophyta
Term
protonema
Definition
mass of green, branched, one-cell-thick filaments produced by germinated moss spores
Term
gametophore
Definition
mature gamete-producing structure of a moss gametophyte
Term
rhizoids
Definition
long, tubular single cell or filament or cells that anchors bryophytes to the ground; not composed of tissues, lack specialized conducing cells, do not play a primary role in water and nutrient absorption
Term
foot
Definition
portion of a bryophyte sporophyte that gathers sugars, amino acids , water, and minerals from the parent gametophyte via transfer cells
Term
seta
Definition
elongated stalk of a bryophyte sporophyte
Term
peristone
Definition
ring of interlocking, tooth-like structures on the upper part of a moss capsule, often specialized for gradual spore discharge
Term
stomata
Definition
microscopic pore surrounded by guard cells in the epidermis of leaves and stems that allows gas exchange between the environment and the interior of the plant
Term
tracheids
Definition
long, tapered water conducting cell found in the xylem of nearly all vascular plants
Term
lignin
Definition
hard material embeded in the cellulose matrix of vascular plant cell walls that provides structural support in terrestrial species
Term
roots
Definition
organ in vaxcular plants that anchors the plant and enables it to absorb water and minerals from the soil
Term
leaves
Definition
main photosynthetic organ of vascular plants
Term
microphylls
Definition
in lycophytes a small leaf with a single unbranched vein
Term
megaphylls
Definition
leaf with a highly branched vascular system, characteristic of the vast majority of vascular plants
Term
sporophylls
Definition
modified leaf that bears sporangia and hence is specialized for reproduction
Term
strobili
Definition
technical term for a cluster of sporophylls known commonly as a cone, found in most gynosperms and some seedless vascular plants
Term
homosporous
Definition
term referring to a plant species that has a single kind of spore, which typically develops into a bisexual gametophyte
Term
heterosporous
Definition
term referring to a plant spcies that has two kinds of spores: microspores, which develop into male gametophytes, and megaspores, whic hdevelop into female gametophytes
Term
megaspores
Definition
spore from a heterosporous plant species that develops into a female gametophyte
Term
microspores
Definition
spore from a heterosporous plant species that develops into a male gametophyte
Term
integument
Definition
layer of sporophyte tissue that contributes to the structure of an ovule of a seed plant
Term
pollination
Definition
transfer of pollen to the part of a seed plant containing the ovules, a process required for fertilizatoin
Term
progymnosperms
Definition
an extinct seedless vascular plant that may be ancestral to seed plants
Term
sepals
Definition
modified leaf in angiosperms that helps enclose and protect a flower bud before it opens
Term
petals
Definition
modified leaf of a flowering plant; often colorful parts of a flower that advertise it to insects and other pollinators
Term
stamens
Definition
pollen-producing reproductive organ of a flower, consisting of an anther and a filament
Term
filament
Definition
in an angiosperm, the stalk portion of the stamen, the pollen-producing reproductive organ of a flower
Term
anther
Definition
in an angiosperm, the the terminal pollen sac of a stamen, where pollen grains containing sperm-producing male gametophytes form
Term
carpels
Definition
ovule-producing reproductive organ of a flower, consisting of the stigma, style, and ovary
Term
stigma
Definition
sticky part of a flower's carpel, which traps pollen grains
Term
style
Definition
stalk of a flower's carpel, with the ovary at the base and the stigma at the top
Term
embryo sac
Definition
female gametophyte of angiosperms, formed from the growth and division of the megaspore into a multicellular structure that typically has eight haploid nuclei
Term
micropyle
Definition
pore in the integument(s) of an ovule
Term
cotyledons
Definition
seeed leaf of an angiosperm embryo; some have one, others two
Term
monocots
Definition
member of a clade consisting of flowering plants that have one embryonic seed leaf, or cotyledon
Term
dicots
Definition
term traditionally used to refer to flowering plants that have two embryonic seed leaves or cotyldons; do not form a clade
Term
eudicots
Definition
member of a clade consisting of the vast majority of flowering plants that have two embryonic seed leaves or cotyldons
Term
basal angiosperms
Definition
member of a clade of three early-diverging lineages of flowering plants
Term
magnoliids
Definition
member of the angiosperm clade most closely related to eudicots
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