Biochemistry - Biological Energetics

1

A biochemist is studying two metabolic reactions at constant temperature and pressure. Reaction 1 is found to have a $\Delta$ G value of $-17.5 \frac{kJ}{mol}$ . Reaction 2 has a $\Delta$ G value of $-2057.6 \frac{kJ}{mol}$ . Which statement is true about these reactions?

2

$A + B \rightarrow C + D$

For this reaction, $\Delta G = -35\frac{kJ}{mol}$ at given reaction conditions.

Which of the following statements concerning the reaction is true?

3

Regarding formation of double stranded DNA from two complementary single strands, which of the following is true?

4

What is reaction coupling?

5

The standard free energy change for any chemical reaction becomes less favorable when __________.

6

Consider the hydrolysis of a molecule of ATP, as shown by the reaction below:

$ATP^{4-}+H_{2}O\rightleftharpoons ADP^{3-}+P_{i}+H^{+}$

If the pH of the solution in which this reaction is occurring were to be lowered, what effect would this have on the above reaction?

7

The high energy found in a molecule of adenosine triphosphate (ATP) is stored mostly in which type of bond?

8

Why is polymerization of nucleoside triphosphates thermodynamically favorable?

9

Which of the following types of transport require ATP to function?

I. Diffusion

II. Facilitated diffusion

III. Primary active transport

IV. Secondary active transport

10

Some reactions that occur within cells have a large, positive standard free energy change. How is it that these reactions are able to occur, given that they are so energetically unfavorable?

Biological Energetics

Practice Questions