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Biology Unit 6 practice test


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Which of the following is NOT an example of a heterotroph?

a. mushroom
b. leopard
c. grass
d. human
c. grass
What are the three parts of an ATP molecule?

a.adenine, thylakoids, stroma
c.adenine, ribose, phosphate groups
b.stroma, grana, chlorophyll
c. adenine, riose, phosphate groups
Energy is released from ATP when

a.a phosphate group is added.
c.ATP is exposed to sunlight.
b.adenine bonds to ribose.
d.a phosphate group is removed.
d. a phosphate group is removed
In Figure 8–1, between which parts of the molecule must the bonds be broken to form an ADP molecule?

a.A and B
c.C and D
b.B and C
d.all of the above
c. C and D
Jan van Helmont concluded that plants gain most of their mass from

c.carbon dioxide in the air.
b.the soil.
d.oxygen in the air.
a. water
A student is collecting the gas given off from a plant in bright sunlight at a temperature of 27°C. The gas being collected is probably

b.carbon dioxide.
d.vaporized water.
a. oxygen
Photosynthesis uses sunlight to convert water and carbon dioxide into

b.high-energy sugars and starches.
c.ATP and oxygen.
d.oxygen and high-energy sugars and starches.
d. oxygen and high-energy sugars and starches
In the overall equation for photosynthesis, six molecules of carbon dioxide result in six molecules of

c. oxygen
Which region of the visible spectrum is not absorbed well by chlorophyll?

a. blue c. green
b. violet d. red
c. greeb
A granum is a

a. stack of chloroplasts. c. membrane enclosing a thylakoid.
b. stack of thylakoids. d. photosynthetic pigment molecule.
b. stack of thylakoids
The stroma is the region outside the

a. thylakoids. c. plant cells.
b. chloroplasts. d. all of the above
a. thylakoids
Which of the following is false?

a. A chloroplast contains stroma. c. A granum contains several thylakoids.
b. A stroma contains a thylakoid. d. A thylakoid contains chlorophyll.
b. A stroma contains a thylakoid
Where do the light-dependent reactions take place?

a. in the stroma c. within the thylakoid membranes
b. in the mitochondria d. only in chlorophyll molecules
c. within the thylakoid membranes
What are the products of the light-dependent reactions?

a. oxygen gas c. NADPH
b. ATP d. all of the above
d. all of the above
Which step is the beginning of photosynthesis?

a. Pigments in photosystem I absorb light.
b. Pigments in photosystem II absorb light.
c. High-energy electrons move through the electron transport chain.
d. ATP synthase allows
b. Pigments in Photosystem II absorb light.
Why does the inside of the thylakoid membrane become positively charged during the light-dependent reactions?

a. H+ ions are released as water splits.
b. ATP synthase allows H+ ions to pass through the membrane.
c. ATP synthase pr
a. H+ ions are released as water splits
Which pathway represents the flow of electrons during photosynthesis?

a. H2O ® Photosystem I ® Photosystem II
b. O2 ® ADP ® Calvin cycle
c. Photosystem I ® Calvin cycle ® NADPH
d. H2O ® NADPH ® Calvin cycle
d. H2O NADPH Calvin Cycle
Where are photosystems I and II found?

a. in the stroma c. in the Calvin cycle
b. in the thylakoid membrane d. all of the above
b. in the thylakoid membrane
The Calvin cycle is another name for

a. light-independent reactions. c. photosynthesis.
b. light-dependent reactions. d. all of the above
a. light-independednt reactions
The Calvin cycle takes place in the

a. stroma. c. thylakoid membranes.
b. photosystems. d. chlorophyll molecules.
a. stroma
How does the Calvin cycle differ from the light-dependent reactions?

a. It takes place in the stroma. c. It requires light.
b. It takes place in chloroplasts. d. It takes place in the thylakoid.
a. It takes place in the stroma
Which of the following is NOT a stage of cellular respiration?

a. fermentation c. glycolysis
b. electron transport d. Krebs cycle
a. fermentation
Which of the following is the correct sequence of events in cellular respiration?

a. glycolysis ® fermentation ® Krebs cycle
b. Krebs cycle ® electron transport ® glycolysis
c. glycolysis ® Krebs cycle ® electron transport <
c. glycolosis Krebs cycle electron transport
Which of the following is released during cellular respiration?

a. oxygen c. energy
b. air d. lactic acid
c. energu
What is the correct equation for cellular respiration?

a. 6O2 + C6H12O6 ® 6CO2 + 6H2O + Energy
b. 6O2 + C6H12O6 + Energy ® 6CO2 + 6H2O
c. 6CO2 + 6H2O ® 6O2 + C6H12O6 + Energy
d. 6CO2 + 6H2O + Energy ® 6O2 + C6H12O6
a. 6O2+C6H12O6 6C02+6H20+Energy
Cellular respiration releases energy by breaking down

a. food molecules. c. carbon dioxide.
b. ATP. d. water.
a. food molecules
Which of these processes takes place in the cytoplasm of a cell?

a. glycolysis c. Krebs cycle
b. electron transport d. all of the above
Glycolysis provides a cell with a net gain of

a. 2 ATP molecules. c. 18 ATP molecules.
b. 4 ATP molecules. d. 36 ATP molecules.
d. 36 ATP molecules
The starting molecule for glycolysis is

a. ADP. c. citric acid.
b. pyruvic acid. d. glucose.
d. glucose
Glycolysis requires

a. an energy input.
b. oxygen.
c. hours to produce many ATP molecules.
d. NADP+.
a. an energy input
Which of the following acts as an electron carrier in cellular respiration?

a. NAD+ c. ADP
b. pyruvic acid d. ATP
a. NAD+
Lactic acid fermentation occurs in

a. bread dough. c. muscle cells.
b. any environment containing oxygen. d. mitochondria.
c. muscle cells
The two main types of fermentation are called

a. alcoholic and aerobic. c. alcoholic and lactic acid.
b. aerobic and anaerobic. d. lactic acid and anaerobic.
c. alcoholic and lactic acid
In the presence of oxygen, glycolysis is followed by

a. lactic acid fermentation. c. photosynthesis.
b. alcoholic fermentation. d. the Krebs cycle.
d. the Krebs cycle
The starting molecule for the Krebs cycle is

a. glucose. c. pyruvic acid.
b. NADH. d. coenzyme A.
c. pyruvic acid

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