Q: Which of the following best represents the overall chemical equation for photosynthesis as shown in the diagram?

$$6CO_2 + 6H_2O \xrightarrow{\text{solar energy}} C_6H_{12}O_6$ + 6O_2$$

Question 1

Which of the following best represents the overall chemical equation for photosynthesis as shown in the diagram?

Accepted Answer

$$6CO_2 + 6H_2O \xrightarrow{	ext{solar energy}} C_6H_{12}O_6$ + 6O_2$$

Question 2

In the context of the diagram, what is the primary role of solar energy in photosynthesis?

Accepted Answer

To drive the endergonic reaction that converts carbon dioxide and water into glucose and oxygen

Question 3

Which process is depicted as the reverse of photosynthesis in the diagram, and what is its main outcome?

Accepted Answer

Cellular respiration; production of chemical energy (ATP) and heat

Question 4

Based on the sucrose structure shown, which type of bond links glucose and fructose?

Accepted Answer

A glycosidic bond

Question 5

Which of the following best describes the structural organization of the chloroplast as shown in the diagram?

Accepted Answer

It contains an outer membrane, an inner membrane, and a third membrane system called thylakoids arranged in stacks called grana.

Question 6

What is the main function of the thylakoid membrane system in the chloroplast?

Accepted Answer

To house the components of the light reactions, including photosystems, electron transport chain, and ATP synthase

Question 7

In the photoexcitation diagram, what happens to an electron when a photon is absorbed by a pigment molecule?

Accepted Answer

It is excited from a ground state to a higher energy state

Question 8

Which of the following statements about resonance energy transfer is correct?

Accepted Answer

It involves the transfer of energy, but not electrons, between pigment molecules.

Question 9

Why is the Calvin cycle considered a hub for multiple biosynthetic and metabolic pathways?

Accepted Answer

It produces intermediates that feed into nucleotide, amino acid, and lipid biosynthesis, and connects to glycolysis and the pentose phosphate pathway.

Question 10

Which of the following best explains why the visible spectrum is optimal for photosynthesis?

Accepted Answer

Visible light has enough energy to excite electrons in chlorophyll without causing photodamage.

Question 11

Which molecule is the direct product of the Calvin cycle that can be used for biosynthesis of glucose and other compounds?

Accepted Answer

Glyceraldehyde-3-phosphate (G3P)

Question 12

What is the main role of rubisco in the Calvin cycle?

Accepted Answer

To catalyze the fixation of CO$$_2 to $$ribulose-1,5-bisphosphate (RuBP)

Question 13

Which of the following is a similarity between the electron transport chains in mitochondria and chloroplasts?

Accepted Answer

Both generate a proton gradient across a membrane to drive ATP synthesis via ATP synthase.

Question 14

Which of the following is a direct output of the light reactions that is required for the Calvin cycle?

Accepted Answer

ATP and NADPH

Question 15

What is the fate of the oxygen produced during the light reactions of photosynthesis?

Accepted Answer

It is released as a byproduct into the atmosphere.

Question 16

Which of the following best describes the process of photoreduction in oxygenic phototrophs?

Accepted Answer

The light-dependent generation of NADPH using electrons from water, releasing oxygen as a byproduct.

Question 17

Which of the following is a key regulatory mechanism for the Calvin cycle in photosynthetic cells?

Accepted Answer

Activation of enzymes by high stromal pH and magnesium concentrations in the light.

Question 18

Which of the following best explains why the Calvin cycle requires both ATP and NADPH?

Accepted Answer

ATP provides energy and NADPH provides reducing power for the reduction of 3-phosphoglycerate to G3P.

Question 19

Which of the following is a major storage carbohydrate in most plants, as indicated in the study materials?

Accepted Answer

Starch

Question 20

Which of the following is a major transport carbohydrate in most plants?

Accepted Answer

Sucrose

Phototrophic Energy Metabolism: Photosynthesis – Study Notes

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