Question 1

Refer to the first image. What does the label 'A' represent in the context of an enzyme-catalyzed reaction?

Accepted Answer

The energy of activation ($$E_A)$$

Question 2

Based on the second image, what happens to the reaction rate in region C as substrate concentration increases?

Accepted Answer

The reaction rate remains constant because the enzyme is saturated

Question 3

Refer to the third image. What does the graph illustrate about the enzyme catalase's activity at different pH levels?

Accepted Answer

Catalase activity is highest at neutral pH and decreases at both lower and higher pH values

Question 4

Refer to the fourth image. What is the primary role of ATP in cellular metabolism as depicted in the diagram?

Accepted Answer

ATP couples energy released from catabolism to energy required for cellular work

Question 5

In the fifth image, which molecule is oxidized during the light reactions of photosynthesis?

Accepted Answer

H$$_2O$$

Question 6

In the sixth image, which structure labeled (A-E) corresponds to the thylakoid membrane, where the light reactions of photosynthesis occur?

Accepted Answer

D

Question 7

Refer to the seventh image. What is the main product of the Calvin cycle that is exported from the chloroplast for use in the cell?

Accepted Answer

G3P (glyceraldehyde-3-phosphate)

Question 8

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in complex organic molecules; cellular respiration releases energy from complex organic molecules.

Question 9

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy ($$E_A) of a $$reaction but do not change the overall free energy change ($$\Delta G).$$

Question 10

A chemical reaction has a negative $$\Delta G. $$Which of the following statements is true?

Accepted Answer

The reaction is exergonic and can occur spontaneously.

Question 11

If an enzyme-catalyzed reaction is saturated with substrate and at optimal temperature and pH, what is the best way to increase the rate of product formation?

Accepted Answer

Increase the enzyme concentration.

Question 12

Which of the following is a characteristic feature of anabolic pathways?

Accepted Answer

They consume energy to build up polymers from monomers.

Question 13

During aerobic cellular respiration, which process produces the majority of ATP?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 14

Which of the following is the correct balanced equation for photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 15

Which of the following statements best describes the function of the electron transport chain in mitochondria?

Accepted Answer

It uses redox reactions to create a proton gradient across the inner mitochondrial membrane.

Question 16

What is the main function of fermentation in the absence of oxygen?

Accepted Answer

To regenerate NAD$$^+ so $$glycolysis can continue

Question 17

Which of the following is evidence supporting the endosymbiotic theory for the origin of mitochondria and chloroplasts?

Accepted Answer

They contain their own circular DNA similar to prokaryotes.

Question 18

Which of the following best describes the flow of electrons during photosynthesis?

Accepted Answer

H$$_2O$$ → NADPH → Calvin cycle

Question 19

During chemiosmosis in chloroplasts, where do protons accumulate to drive ATP synthesis?

Accepted Answer

Thylakoid space (lumen)

Question 20

Which of the following is the final electron acceptor in the mitochondrial electron transport chain during aerobic respiration?

Accepted Answer

O$$_2$$

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