Question 1

Plastocyanin (PC)

Accepted Answer

Plastocyanin is a mobile electron carrier that carries only a single electron at a time in the photosynthetic electron transport chain. It is not called plastoquinol.

Question 2

The Hatch- Slack cycle occurs in which of the following types of plants?

Accepted Answer

The Hatch-Slack cycle, also known as the C4 pathway, occurs in C4 plants, which include many tropical grasses.

Question 3

The endosymbiotic theory states that mitochondria originated from

Accepted Answer

The endosymbiotic theory suggests that mitochondria originated from purple bacteria (a type of prokaryote) that entered into a symbiotic relationship with a host cell, eventually becoming a permanent organelle within the eukaryotic cell.

Question 4

Which three organelles are involved in the glycolate pathway?

Accepted Answer

The glycolate pathway, also known as photorespiration, involves the peroxisome, chloroplast, and mitochondrion. These organelles work together to recycle 2-phosphoglycolate produced during photosynthesis.

Question 5

Based upon the comparisons of anoxygenic and oxygenic photosythesis, the entry of oxygen into the atmosphere is most directly attributed to

Accepted Answer

Photosystem II is responsible for the splitting of water molecules during oxygenic photosynthesis, releasing oxygen into the atmosphere.

Question 6

Which of the following statements regarding CAM plants is true?

Accepted Answer

CAM plants store malate in large vacuoles during the night when stomata are open, allowing them to fix CO₂ and use it during the day for photosynthesis.

Question 7

The plants referred to as C₃ and C4 plants get this designation based on the number of carbons in the first detectable product of carbon dioxide fixation. The C₃ product is , whereas the C4 product is .

Accepted Answer

C₃ plants produce 3-phosphoglycerate as the first detectable product of carbon dioxide fixation, while C₄ plants produce oxaloacetate.

Question 8

Biosynthesis of sucrose occurs in the

Accepted Answer

The answer of Biosynthesis of sucrose occurs in the
...

Question 9

Which of the following statements correctly characterizes the relationship between NADP+/NADPH and NAD+/NADH?

Accepted Answer

The answer of Which of the following statements correctly characterizes...

Question 10

Photoheterotrophs are best described as organisms that obtain energy to make ATP

Accepted Answer

Photoheterotrophs obtain energy from sunlight but rely on organic compounds from the environment, rather than CO₂, for carbon.

Question 11

Carbon dioxide generally enters the plant through pores called

Accepted Answer

Carbon dioxide enters the plant through stomata, which are small openings on the surface of leaves.

Question 12

Which two triose phosphates are produced during the Calvin cycle and are the starting points for starch and sucrose synthesis?

Accepted Answer

Dihydroxyacetone phosphate and glyceraldehyde-3-phosphate are the two triose phosphates produced during the Calvin cycle that are the starting points for starch and sucrose synthesis.

Question 13

Which of the following is NOT an accessory pigment used to absorb photons that cannot be captured by chlorophyll?

Accepted Answer

Phycochlorophyll is not a recognized accessory pigment. Accessory pigments like phycobilin, lutein, beta-carotene, and phycocyanin help capture light energy that chlorophyll cannot absorb efficiently.

Question 14

The Emerson enhancement effect

Accepted Answer

The Emerson enhancement effect is a synergistic phenomenon (C) that results from the interaction of two distinct photosystems (D) in photosynthesis, leading to increased efficiency when both photosystems are activated simultaneously.

Question 15

Of the following plastids, which is NOT paired with the proper contents?

Accepted Answer

Amyloplasts store starch, not amylase.

Question 16

Which of the following statements accurately describes the Calvin cycle?

Accepted Answer

The Calvin cycle is a series of biochemical reactions that occur in the chloroplast stroma, where carbon dioxide is fixed and reduced to produce organic sugars, making all the statements correct.

Question 17

Which of the following products CANNOT be used in the Calvin cycle?

Accepted Answer

Phosphoglycolate is not used in the Calvin cycle; it is a byproduct of photorespiration.

Question 18

The ATP synthase complex in the thylakoid membrane

Accepted Answer

ATP synthase in the thylakoid membrane performs photophosphorylation in oxygenic phototrophs, converting ADP and inorganic phosphate into ATP using the proton gradient generated by light-driven electron transport.

Question 19

The regeneration of what CO₂ acceptor molecule allows for continuous carbon assimilation in the Calvin cycle?

Accepted Answer

Ribulose-1,5-bisphosphate (RuBP) is the CO₂ acceptor molecule that is regenerated in the Calvin cycle, allowing for continuous carbon assimilation.

Question 20

Which of the following pigments is found exclusively in red algae?

Accepted Answer

Phycoerythrin is a pigment found exclusively in red algae, giving them their characteristic red color.

Quiz 11: Phototrophic Energy Metabolism: Photosynthesis