[8] Mastering Biology

Question 1

Where does the Calvin cycle take place?

Answer 1

stroma of the chloroplast

Question 2

When oxygen is released as a result of photosynthesis, it is a direct by-product of

Answer 2

splitting water molecules.

Question 3

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

Answer 3

ATP and NADPH

Question 4

If photosynthesizing green algae are provided with CO2 containing heavy oxygen (18O), subsequent analysis will show that 18O is absent from which of the following molecules produced by the algae?

Answer 4

O2

Question 5

A reduction in the amount of NADP+ available in plant cells in the light will ultimately result in

Answer 5

a decrease in the rate of linear electron flow.

Question 6

The splitting of carbon dioxide to form oxygen gas and carbon compounds occurs during

Answer 6

neither photosynthesis nor respiration.

Question 7

In mitochondria, the electron transport chain pumps protons from the matrix into the intermembrane space, whereas in chloroplasts, the electron transport chain pumps protons from

Answer 7

the stroma to the thylakoid space.

Question 8

In a plant cell, where are ATP synthase complexes located?

Answer 8

thylakoid membrane and inner mitochondrial membranes

Question 9

Which of the following is directly associated with photosystem I?

Answer 9

receiving electrons from the thylakoid membrane electron transport chain

Question 10

Which of the following events occurs in the light reactions of photosynthesis?

Answer 10

Light is absorbed and funneled to reaction-center chlorophyll a.

Question 11

A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?

Answer 11

blue and violet

Question 12

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

Answer 12

The light reactions provide ATP and NADPH to the Calvin cycle, and the Calvin cycle returns ADP, i, and NADP+ to the light reactions.

Question 13

The NADPH required for the Calvin cycle comes from

Answer 13

reactions initiated in photosystem I.

Question 14

What compound provides the reducing power for the Calvin cycle reactions?

Answer 14

NADPH

Question 15

What is the relationship between wavelength of light and the quantity of energy per photon?

Answer 15

They are inversely related.

Question 16

Reduction of oxygen to form water occurs during

Answer 16

cellular respiration only.

Question 17

What are the products of linear electron flow?

Answer 17

ATP and NADPH

Question 18

Reactions that consume CO2 take place in

Answer 18

the Calvin cycle only.

Question 19

Where do the enzymatic reactions of the Calvin cycle take place?

Answer 19

stroma of the chloroplast

Question 20

What is the primary function of the Calvin cycle?

Answer 20

produce simple sugars from carbon dioxide