AP Biology Unit 2 Review

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49 Terms

1

active transport

Energy-requiring process that moves material across a cell membrane against a concentration difference

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2

apoptosis

programmed cell death

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3

aquaporin

A transport protein in the plasma membrane of a plant or animal cell that specifically facilitates the diffusion of water across the membrane

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4

carrier protein

Transport protein that changes shape when a particle binds with it

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5

cell wall

A rigid layer of nonliving material that surrounds the cells of plants and some other organisms.

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6

centrioles

a minute cylindrical organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division.

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7

channel protein

protein that forms a channel to allow a particular molecule or ion to cross the plasma membrane

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8

chloroplast

organelle found in cells of plants and some other organisms that captures the energy from sunlight and converts it into chemical energy

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9

concentration gradient

difference in the concentration of a substance from one location to another

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10

cytoplasm

A jellylike fluid inside the cell in which the organelles are suspended

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11

cytoskeleton

A network of fibers that holds the cell together, helps the cell to keep its shape, and aids in movement

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12

diffusion

Movement of molecules from an area of higher concentration to an area of lower concentration.

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13

endocytosis

A process in which a cell engulfs extracellular material through an inward folding of its plasma membrane.

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14

Golgi apparatus

A system of membranes that modifies and packages proteins for export by the cell

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15

hypertonic

when comparing two solutions, the solution with the greater concentration of solutes

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16

hypotonic

when comparing two solutions, the solution with the lesser concentration of solutes

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17

isotonic

when the concentration of two solutions is the same

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18

lysosome

cell organelle filled with enzymes needed to break down certain materials in the cell

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19

nuclear envelope

A double membrane that surrounds the nucleus in the cell

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20

phospholipid

A molecule that is a constituent of the inner bilayer of biological membranes, having a polar, hydrophilic head and a nonpolar, hydrophobic tail.

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21

plasma membrane

A selectively-permeable phospholipid bilayer forming the boundary of the cells

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22

plasmolysis

Collapse of a walled cell's cytoplasm due to a lack of water

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23

prokaryotic cell

A type of cell lacking a membrane-enclosed nucleus and membrane-enclosed organelles; found only in the domains Bacteria and Archaea.

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24

ribosome

site of protein synthesis

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25

rough ER

ER that is dotted with ribosomes

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26

selectively permeable

a property of cell membranes that allows some substances to pass through, while others cannot

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27

smooth ER

ER that has no ribosomes

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28

exocytosis

a process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane.

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29

eukaryotic cell

cell that has a nucleus and other membrane-bound organelles

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30

facilitated diffusion

Movement of specific molecules across cell membranes through protein channels

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31

flagella

A long, whip-like filament that helps in cell motility.

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32

fluid mosaic model

Structural model of the plasma membrane where molecules are free to move sideways within a lipid bilayer.

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33

nucleus

A part of the cell containing DNA and RNA and responsible for growth and reproduction

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34

organelles

A tiny cell structure that carries out a specific function within the cell

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35

osmosis

Diffusion of water through a selectively permeable membrane

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36

passive transport

the movement of substances across a cell membrane without the use of energy by the cell

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37

phagocytosis

A type of endocytosis in which a cell engulfs large particles or whole cells

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38

surface area: volume ratio

a variable that decreases as cells grow, so that it sets a limit to the size of cells.

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39

transmembrane protein

integral membrane protein that spans the entire width of a cell membrane

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40

vacuole

Cell organelle that stores materials such as water, salts, proteins, and carbohydrates

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41

endoplasmic reticulum

A cell structure that forms a maze of passageways in which proteins and other materials are carried from one part of the cell to another.

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42

vesicle

Small membrane-bound sac that functions in moving products into, out of, and within a cell.

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43

endomembrane system

The collection of membranes inside and around a eukaryotic cell, related either through direct physical contact or by the transfer of membranous vesicles.

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44

mitochondria

organelle that is the site of ATP (energy) production; contains a double membrane as well as its own DNA and ribosomes

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45

cholesterol

a lipid that prevents the membrane from becoming too flexible as well as from crystalizing

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46

glycoprotein

A protein with one or more carbohydrates covalently attached to it; found on the exterior portion of the cell membrane for cell signaling

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47

glycolipid

a lipid with one or more covalently attached carbohydrates; found on the exterior portion of the cell membrane for cell signaling

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48

integral protein

a type of membrane protein that is permanently attached to the biological membrane.

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49

peripheral protein

A protein loosely bound to the surface of a membrane or to part of an integral protein and not embedded in the lipid bilayer.

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