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Apologia Biology
Mod 3--Vocabulary
23
Biology
9th Grade
09/17/2011

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Term
Psuedopod
Definition
A temporary, foot-like
extension of a cell, used for locomotion or engulfing
food
Term
Nucleus
Definition
The region of a eukaryotic cell
which contains the cell’s main DNA
Term
Vacuole
Definition
A membrane-bound "sac" within
a cell
Term
Ectoplasm
Definition
The thin, watery
cytoplasm near the plasma membrane of some cells
Term
Endoplasm
Definition
The dense cytoplasm
found in the interior of many cells
Term
Flagellate
Definition
A protozoan that propels itself
with a flagellum
Term
Pellicle
Definition
A firm, flexible coating outside the
plasma membrane
Term
Choloroplast
Definition
An organelle containing
chlorophyll for photosynthesis
Term
Chlorophyll
Definition
A pigment necessary for
photosynthesis
Term
Eyespot
Definition
A light-sensitive region in certain protozoa
Term
Symbiosis
Definition
A relationship between two
or more species where at least one benefits
Term
Mutalism
Definition
A relationship between two or more
organisms of different species where all benefit from the
association
Term
Commensalism
Definition
A relationship between two organisms
of different species where one benefits and the other is
neither harmed nor benefited
Term
Parasitism
Definition
A relationship between two organisms of
different species where one benefits and the other is
harmed
Term
Cilia
Definition
Hair-like projections that extend from
the plasma membrane and are used for locomotion
Term
Spore
Definition
A reproductive cell with a hard, protective
coating
Term
Plankton
Definition
Tiny organisms that float in the
water
Term
Zooplankton
Definition
Tiny floating organisms
that are either small animals or protozoa
Term
Phytoplankton
Definition
Tiny floating
photosynthetic organisms, primarily algae
Term
Thallus
Definition
The body of a plant-like organism that is not
divided into leaves, roots, or stems
Term
Cellulose
Definition
A substance (made of sugars) that is common
in the cell walls of many organisms.
Term
Holdfast
Definition
A special structure used by an organism to
anchor itself
Term
Sessile Colony
Definition
A colony that uses holdfasts to anchor
itself to an object
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