1 Cells can use ATP to a Drive conformation change for examp

1. Cells can use ATP to

a. Drive conformation change, for example, in motor proteins

b. Drive thermodynamically unfavorable reactions.

c. Phosphorylate proteins to inactivate them.

d. All of the above.

2. In order to do the useful work of making new macromolecules cells generate large amounts of _______, used to do chemical work, and _________ which provides high energy electrons used for reduction reactions.

a. ADP / NAD⁺

b. NADPH / ATP

c.ATP / NADPH

d. AMP / GTP

3. You have identified a mutation in a G protein that causes the G protein to remain “active” much longer than normal. Which of the following might be the explanation for this:

a. The mutant G protein hydrolyzes GTP much more slowly than the normal G protein.

b. The mutant G protein can no longer interact with another protein that stimulates the binding of GTP

c. The mutant G protein can no longer interact with another protein that stimulates it’s hydrolysis of GTP

d. Both a and c.

4. Which of the following is not true of Nucleosomes

a. They contain histones H2A, H2B, H3 and H4

b. The DNA is wrapped around the histone core almost 2 times

c. The histone core contains a total of 8 proteins

d. Histones are acidic proteins so that they can interact well with DNA

5. If the coloring of calico cats is due to X chromosome inactivation, which of the following will not be true?

a. Calico cats with identical patterns will be rare

b. Calico cats can be male or female

c. Patches of the same color represent cells that share a common lineage

Solution

Answer:

1).

b. Drive thermodynamically unfavorable reactions.

Any chemicl reaction must be favoured thermodynamicall by energy. ATP provides energy.

2). c.ATP / NADPH

ATP is used directly as enegy compund to do work in the living cells.

NADH must be enetered in the electron transport chain. Then, it produces ATPs(energy)

3).

a. The mutant G protein hydrolyzes GTP much more slowly than the normal G protein.

4).

d. Histones are acidic proteins so that they can interact well with DNA

Histones are basic and sugar phosphate back bone is acidic.

5).

a. Calico cats with identical patterns will be rare

Calico cats are only female as they contain two X chromosomes