Exploring Creation with Biology: Module 3

2nd Edition. Terms & Definitions.

Pseudopod

A temporary, foot-like extension of a cell, used for locomotion or engulfing food.

Nucleus

The region of a eukaryotic cell that contains the cell’s main DNA.

Vacuole

A membrane-bounded “sac” within a cell.

Ectoplasm

The thin, watery cytoplasm near the plasma membrane of some cells.

Endoplasm

The dense cytoplasm found in the interior of many cells.

Flagellate

A protozoan that propels itself with a flagellum.

Pellicle

A firm, flexible coating outside the plasma membrane.

Chloroplast

An organelle containing chlorophyll for photosynthesis.

Chlorophyll

A pigment necessary for photosynthesis.

Eyespot

A light-sensitive region in certain protozoa.

Symbiosis

A close relationship between two or more species where at least one benefits.

Mutualism

A relationship between two or more organisms of different species where all benefit from the association.

Commensalism

A relationship between two organisms of different species where one benefits and the other is neither harmed nor benefited.

Parasitism

A relationship between two organisms of different species where one benefits and the other is harmed.

Cilia

Hairlike projections that extend from the plasma membrane and are used for locomotion.

Spore

A reproductive cell with a hard, protective coating.

Plankton

Tiny organisms that float in the water.

Zooplankton

Tiny floating organisms that are either small animals or protozoa.

Phytoplankton

Tiny floating photosynthetic organisms, primarily algae.

Thallus

The body of a plant-like organism that is not divided into leaves, roots, or stems.

Cellulose

A substance (made of sugars) that is common in the cell walls of many organisms.

Holdfast

A special structure used by an organism to anchor itself.

Sessile colony

A colony that uses holdfasts to anchor itself to an object.