4. During certain stages of stages of cellular respiration, electrons are transf

Question

4. During certain stages of stages of cellular respiration, electrons are transferred from glucose molecules to a molecule called nicotinamide adenine dinucleotide (NAD+). In this example, a. glucose is oxidized and NAD+ is reduced

b. glucose is reduced and NAD+ is oxidized

c. both glucose and NAD+ have gained protons

d. glucose has gained protons and NAD+ has lost protons

5. When a bear eats a salmon, some of the energy stored in the salmon is used by the bear for its activities and growth. Much of this energy originally in the salmon is dissipated as heat, this is an example of:

a. the first law of thermodynamics

b. the second law of thermodynamics

c. 100% efficient energy conversation

d. a conversion of kinetic energy to potential energy

6. An inactive protein becomes activated by ATP. How does ATP activate the protein?

a. a high energy phosphate form ATP attaches to the protein

b. ATP is an enzyme

c. ATP removes a phosphate from the protein

d. An ATP molecule binds directly to the protein

13. Which statement about the influence of temperature on enzymes is NOT true?

a. all enzymes have the same intrinsic optimal temperature

b. raising the temperature may increase the activity of an enzyme

c. some enzymes are stable at the boiling point of water

d. raising the temperature may decrease the activity of an enzyme

15. The enzyme aromatase is found in the cytoplasm of some cells and converts testosterone to estrogen. You decide to test aromatase from a particular cell type, and your lab partner admits that he drastically increased the pH in all test tubes. Which of the following is a likely result?

a. the enzyme will be denatured and the substrate will not bind to its active site

b. the enzyme will convert testosterone to estrogen at a faster rate

c. the mistake will have no effect, as enzymes are not sensitive to changes in ph

d. the delta G will be lowered and the reaction will proceed spontaneously

Explanation / Answer

4.a. glucose is oxidized and NAD+ is reduced

5. a. the first law of thermodynamics

6. a. a high energy phosphate form ATP attaches to the protein

13. a. all enzymes have the same intrinsic optimal temperature

15. a. the enzyme will be denatured and the substrate will not bind to its active site

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