Question

a. In the wild, bears are able to keep warm during the winter because of which of the following?

1. by using hot water bottles.

2. they produce more ATP.

3. metabolism of a special form of glucose.

4. uncoupling the proton gradient and ATP synthase.

5. increased rates of photorespiration.

b. A cell that was not able to do work would be which of the following?

1. metabolically active.

2. at a point where all of its reactions were at metabolic disequilibrium.

3. dead.

4. prokaryotic.

5. eukaryotic.

c. Why are bacteria more efficient than eukaryotic cells in terms of the numbers of ATPs they can obtain from glucose? 1. they don’t have a cell wall.

2. their mitochondria are very permeable to ATP.

3. they have more mitochondria than eukaryotes.

4. they produce ATP in the cytosol.

5. they metabolise special forms of sugars.

d. The change in membrane potential that occurs during a nerve impulse can be best described as what?

1. a voltage-gated sodium ion channel.

2. an axon.

3. an action potential.

4. a process of active transport.

5. the movement of ions through the lipid bilayer via simple diffusion.

Answer 1

a. Uncoupling the proton gardient and ATP synthase.(option 4)

b. A cell that was not able to do work can be called as dead cell. (Option 3)

c. Bacteria more efficient from Eukaryotic cell interm of ATP obtaining from glucose because bacteria don't have any membrane bound cell organelle. In cytoplasm they obtain ATP from glucose by both oxidative posphorylation and substrate level posphorylation (option 4)

d. The change in membrane potential that occurs during a nerve impulse can be called as Action Potential, that caused by movement of Na+, K+ ions. (2)