Name
Skills Worksheet
Class Date
Match the words on the left with the statements on the right.
______ 1.
passive transport
______ 2.
concentration gradient
______ 3.
equilibrium
______ 4.
diffusion a.
difference in the concentration of a substance across a space b.
does not require energy from a cell c.
movement of a substance from an area of high concentration to an area of lower concentration d.
concentration of a substance is equal throughout a space
Match the words on the left with the statements on the right.
______ 5.
osmosis
______ 6.
______ 7.
______ 8.
hypertonic solution hypotonic solution isotonic solution a.
causes a cell to shrink because of osmosis b.
produces no change in cell volume because of osmosis c.
diffusion of water through a selectively permeable membrane d.
causes a cell to swell because of osmosis
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Holt Biology 19 Cells and Their Environment

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Name
Vocabulary Review continued
Class Date
Match the words on the left with the statements on the right.
______ 9.
ion channel
______
______
______
10.
11.
12.
carrier protein facilitated diffusion active transport a.
movement of a substance against substance’s concentration gradient b.
passive transport using carrier proteins c.
protein used to transport specific substances d.
transport protein through which ions can pass
Match the words on the left with the statements on the right.
______ 13.
sodium-potassium pump
______
______
______
______
14.
15.
16.
17.
endocytosis exocytosis receptor protein second messenger a.
acts as a signal molecule in the cytoplasm b.
binds to a signal molecule, letting the cell respond to the signal molecule c.
carrier protein used in active transport d.
movement of a substance by a vesicle to the inside of a cell e.
movement of a substance by a vesicle to the outside of a cell
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Holt Biology 20 Cells and Their Environment

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Name
Skills Worksheet
Class Date
Using the word bank below, fill in each blank provided.
autotrophs cellular respiration heterotrophs photosynthesis pigment
___________________________ 1.
the process that changes light energy to chemical energy
___________________________ 2.
organisms that use energy from sunlight to make organic compounds
___________________________ 3.
organisms that get energy by taking in food
___________________________ 4.
the process by which cells take energy from food
___________________________ 5.
a substance that absorbs light
Using the word bank below, fill in each blank provided.
Calvin cycle carbon dioxide fixation chorophyll electron transport chain carotenoids
___________________________ 6.
the main pigment involved in photosynthesis
___________________________ 7.
absorbs wavelengths of light different from those absorbed by chlorophyll
___________________________ 8.
Excited electrons go down this series of molecules into a thylakoid membrane.
___________________________ 9.
the transfer of carbon dioxide to organic compounds
___________________________ 10.
Enzymes cause chemical reactions that make a three-carbon sugar molecule.
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Holt Biology 25 Photosynthesis and Cellular Respiration

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Name
Vocabulary Review continued
Class Date
Using the word bank below, fill in each blank provided.
aerobic anaerobic fermentation glycolysis Krebs cycle thylakoids
___________________________ 11.
a process that requires oxygen
___________________________ 12.
a process that does not require oxygen
___________________________ 13.
the process that breaks down glucose to pyruvate
___________________________ 14.
enzyme-assisted chemical reactions that make carbon dioxide
___________________________ 15.
the recycling of NAD under anaerobic conditions
___________________________ 16.
disk-shaped structures inside chloroplasts
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Holt Biology 26 Photosynthesis and Cellular Respiration