$$6 \mathrm{CO}_2 + 12 \mathrm{H}_2O + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{H}_2O + 6 \mathrm{O}_2$$

Question 1

Which of the following best describes the overall chemical equation for photosynthesis in plants?

Accepted Answer

$$6 \mathrm{CO}_2 + 12 \mathrm{H}_2O + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{H}_2O + 6 \mathrm{O}_2$$

Question 2

Which of the following statements about the light-dependent reactions of photosynthesis is CORRECT?

Accepted Answer

They produce ATP and NADPH, which are used in the Calvin cycle.

Question 3

What is the main function of the enzyme rubisco in the Calvin cycle?

Accepted Answer

It catalyzes the fixation of CO2 to ribulose-1,5-bisphosphate (RuBP).

Question 4

Which of the following best explains why C4 plants are more efficient than C3 plants in hot, dry environments?

Accepted Answer

C4 plants spatially separate carbon fixation from the Calvin cycle, reducing photorespiration.

Question 5

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain under aerobic conditions?

Accepted Answer

$$\mathrm{O}_2$$

Question 6

Which process in cellular respiration produces the most ATP per molecule of glucose?

Accepted Answer

Oxidative phosphorylation

Question 7

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is produced by the direct transfer of a phosphate group from an organic substrate to ADP.

Question 8

Which of the following is a product of lactic acid fermentation in human muscle cells?

Accepted Answer

Lactate and NAD+

Question 9

What is the main role of the proton gradient generated by the electron transport chain in mitochondria?

Accepted Answer

To drive the synthesis of ATP via ATP synthase

Question 10

Which of the following statements about the regulation of glycolysis is TRUE?

Accepted Answer

High levels of ATP inhibit phosphofructokinase, slowing glycolysis.

Question 11

Which of the following best describes the fate of pyruvate in the absence of oxygen in yeast cells?

Accepted Answer

It is converted to ethanol and CO2 through alcohol fermentation.

Question 12

Which of the following is a key difference between cyclic and noncyclic electron flow in the light reactions of photosynthesis?

Accepted Answer

Cyclic electron flow produces only ATP, while noncyclic flow produces both ATP and NADPH.

Question 13

Which of the following is a function of carotenoids in photosynthetic organisms?

Accepted Answer

They absorb light energy and protect chlorophyll from damage.

Question 14

Which of the following best explains why photorespiration is considered wasteful for plants?

Accepted Answer

It consumes ATP and releases CO2 without producing sugars.

Question 15

Which of the following is TRUE about the role of oxygen in cellular respiration?

Accepted Answer

Oxygen acts as the terminal electron acceptor in the electron transport chain.

Question 16

Which of the following is a correct summary of the net products of glycolysis per molecule of glucose?

Accepted Answer

2 ATP, 2 NADH, and 2 pyruvate

Question 17

Which of the following best describes the role of ATP synthase in mitochondria?

Accepted Answer

It uses the energy from a proton gradient to synthesize ATP from ADP and Pi.

Question 18

Which of the following is a major difference between autotrophs and heterotrophs?

Accepted Answer

Autotrophs produce organic molecules from CO2, while heterotrophs consume organic molecules produced by other organisms.

Question 19

Which of the following statements about the Calvin cycle is CORRECT?

Accepted Answer

It uses ATP and NADPH to convert CO2 into G3P (glyceraldehyde-3-phosphate).

Question 20

Which of the following is a real-world application of understanding the process of photosynthesis?

Accepted Answer

Developing biofuels from plant biomass as a renewable energy source.

Photosynthesis and Cellular Respiration: Core Concepts and Mechanisms

Guida di studio - Domande di pratica