Discover Biology

Anu Singh-Cundy

Chapter 6

Photosynthesis and Cellular Respiration - all with Video Answers

Educators

Chapter Questions

Problem 1

The chemical that functions as an energy-carrying molecule in all organisms is
a. carbon dioxide.
c. RuBP.
b. water.
d. ATP.

Nilma Khan

Nilma Khan

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Problem 2

The main function of the Calvin cycle reactions is to produce
a. carbon dioxide.
c. NADPH.
b. sugars.
d. ATP.

Nilma Khan

Numerade Educator

Problem 3

The oxygen produced in photosynthesis comes from
a. carbon dioxide.
c. pyruvate.
b. sugars.
d. water.

Nilma Khan

Numerade Educator

Problem 4

The light reactions in photosynthesis require
a. oxygen.
c. rubisco.
b. chlorophyll.
d. carbon fixation.

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Numerade Educator

Problem 5

Glycolysis occurs in
a. mitochondria.
c. chloroplasts.
b. the cytosol.
d. thylakoids.

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Numerade Educator

Problem 6

The electrons needed to replace those lost from chlorophyll in the light reactions of photosynthesis come ultimately from
a. sugars.
c. water.
b. channel proteins.
d. electron transport chains.

Nilma Khan

Numerade Educator

Problem 7

Cellular respiration
a. converts inhaled oxygen gas into water.
b. occurs in skeletal muscle cells in our body, but not in ordinary cells such as skin cells.
c. converts carbon dioxide into organic molecules.
d. breaks down sugar molecules, releasing oxygen gas as a by-product.

Nilma Khan

Numerade Educator

Problem 8

Which of the following statements is not true?
a. Glycolysis produces most of the ATP required by aerobic organisms like us.
b. Glycolysis produces pyruvate, which is consumed by the Krebs cycle.
c. Glycolysis occurs in the cytosol of the cell.
d. Glycolysis is the first stage of cellular respiration.

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Problem 9

The Krebs cycle reactions
a. take place in the cytoplasm.
b. convert glucose to pyruvate.
c. generate ATP with the help of an enzyme complex called ATP synthase.
d. yield ATP, NADH, and FADH $_{2}$.

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Problem 10

Which of the following is essential for oxidative phosphorylation?
a. rubisco
c. phosphoglycolate
b. NADH
d. chlorophyll

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Problem 11

Oxidative phosphorylation
a. produces less ATP than glycolysis does.
b. produces simple sugars.
c. depends on the activity of ATP synthase.
d. is part of the photosystem I electron transport chain.

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Numerade Educator

Problem 12

In CAM plants
a. stomata open only at night.
b. the first product of carbon fixation is a 3 -carbon molecule.
c. Calvin cycle reactions take place only in bundle sheath cells.
d. photorespiration increases the efficiency of photosynthesis than a typical $\mathrm{C}_{3}$ plant.
e. more water is lost from the plant during photosynthesis than in a typical $\mathrm{C}_{3}$ plant.

Nilma Khan

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