Thinking Through the Concepts Multiple Choice 1. Which of the following is True?

Question

Thinking Through the Concepts Multiple Choice 1. Which of the following is True? a. Enzymes increase activation energy requirements. b. Activation energy is required to initiate exergonic reactions. Heat cannot supply activation energy. c. d. Stomach acid inactivates pepsin. 2. Which is not an example of an exergonic reaction? a. photosynthesis b. a nuclear reaction in the sun c. ATP ADP + Pi d. glucose breakdown .3, which of the following is True? a. ATP is a long-term energy storage molecule. b. ATP can carry energy from one cell to another. c. ADP inhibits glucose breakdown in cells. d. ATP can act as an allosteric regulator molecule. 4. Coupled reactions a. b. c. d. are endergonic overall. both synthesize and break down ATP. are catalyzed by the same enzyme. end with reactants that contain more energy than their products.

Explanation / Answer

Que 1

Ans:

The following is true: b. Activation energy is required to initiate exergonic reactions.

Explanation:

- A chemical reaction that release energy is exergonic.

- Exergonic reactions require some amount of energy input to get going, before they can proceed with their energy releasing steps.

- Hence, activation energy is required to initiate exergonic reactions.

Que 2

Ans:

a. Photosynthesis is not an example of an exergonic reactions.

Explanation:

- Photosynthesis is an endergonic reaction because it require energy.

- Exergonic reaction release energy.

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