Biology - Unit 3 Vocab

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Active Transport

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Energy requiring movement of molecules across the membrane from a region of lower concentration to higher concentration

Front

Cell membrane

Back

Double layer of phospholipids that forms a boundary between a cell and the surrounding environment and controls the passage of materials into and out of a cell

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Cell Wall

Back

Rigid structure that gives protection, support, and shape cells in plants, algae, fungi, and bacteria.

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Centriole

Back

small cylinder-shaped organelle made of protein tubes arranged in a circle; aids mitosis

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centrosome

Back

cellular structure that aids in cell division

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chloroplast

Back

organelle composed of numerous membranes that are used to convert solar energy into chemical energy; contains chlorophyll

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cytoplasm

Back

jellylike substance inside cells that contain molecules where many reactions happen

• also in some cell organelles

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cytosol

Back

the liquid or aqueous part of the cytoplasm

Front

Cytoskeleton

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Network of proteins, such as microtubules and microfilaments, inside a eukaryotic cell that supports and shapes the cell

Front

diffusion

Back

movement of dissolved molecules in a fluid or gas from a region of higher concentration to a region of lower concentration