Exam (elaborations)

Test Bank for Biochemistry, 10th Edition by Jeremy Berg

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Course
Biochemistry

Institution
Biochemistry

Test Bank for Biochemistry, 10th Edition by Jeremy Berg, Gregory Gatto Jr.; Justin Hines; John L. Tymoczko; Lubert Stryer. Full Chapters test bank are included - Chapter 1 to 32 1 Biochemistry in Space and Time 2 Protein Composition and Structure 3 Binding and Molecular Recognit...

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Uploaded on November 11, 2023
Number of pages 417
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Name: Class: Date:

Chap 01 10e Berg

Indicate the answer choice that best completes the statement or answers the question.
1. What is pKa of a buffer solution (pH = 5.05) containing 0.2 M sodium acetate and 0.1 M acetic acid?
a. 4.75
b. 0.2
c. 0.3
d. 4.45
e. 1.58

2. When did life on Earth begin and when did human beings emerge, respectively?
a. 3 billion years ago and 1 billion years ago
b. 3.5 billion years ago and 0.5 billion years ago
c. 3.5 billion years ago and 0.2 billion years ago
d. 3.5 billion years ago and less than 0.1 billion years ago
e. 3.5 billion years ago and 0.1 billion years ago

3. Which statement is INCORRECT if the buffer capacity is not consumed upon addition of a strong acid to the
solution?
a. There are more protonated forms of the buffer compound than deprotonated ones.
b. When hydrogen ions are added to this buffer solution they remain free.
c. The pH differs from the pKa value of the buffer's base component.
d. There are more deprotonated forms of the buffer compound than protonated ones.
e. Such a buffer is not actually a buffer and cannot mitigate the pH changes.

4. What is the direct consequence of the bent shape of a water molecule?
a. Water is highly cohesive.
b. Distribution of charge is asymmetric.
c. Hydrogen atoms possess a net negative charge.
d. The oxygen atom possesses a net positive charge.
e. The water molecule is able to form hydrogen bonds.

5. The structure of DNA described by Watson and Crick includes:
a. a triple helix.
b. a triple helix composed of three intertwined strands.
c. base pairs that are stacked on the inside of the double helix.
d. a sugar-phosphate backbone that lies on the inside of the helix.
e. base pairs that are stacked on the outside of the triple helix.

. Page 1

, Name: Class: Date:

Chap 01 10e Berg

6. What is the number of hydrogen bonds formed between G and C nucleotides?
a. 1
b. 2
c. 3
d. 4
e. 5

7. Which statement about acid–base relations is CORRECT?
a. If [H+] is higher than 10–3, pH is above 3.
b. If [OH– ] is 10–9, pH is 7.
c. If [H+] is lower than 10–9, pH is below 9.
d. If [OH– ] is higher than 10–3, pH is below 3.
e. If [OH– ] is 10–7, pH is 7.

8. Why are free interactions of water molecules in bulk water more favorable than more ordered interactions
with nonpolar compounds?
a. The total entropy in such interactions increases because the Gibbs free energy is positive.
b. The total entropy in such interactions decreases because the Gibbs free energy is negative.
c. The enthalpy of the ordered state is lower than the enthalpy of the bulk state.
d. The total entropy in such interactions increases because the Gibbs free energy is negative.
e. The total entropy in such interactions decreases because the Gibbs free energy is positive.

9. Which statement about nonpolar interactions in the formation of the DNA double helix is INCORRECT?
a. Van der Waals interactions are nearly optimal in a double-helical structure.
b. Nonpolar surfaces of the bases are moved into contact with each other due to a more complete base
stacking.
c. Nucleotide bases tend to stack even in single-stranded DNA molecules.
d. The separation distance of the planes of adjacent bases needs to be adjusted for the favorable van der
Waals contacts.
e. Surface complementarity maximizes the formation of hydrogen bonds and van der Waals interactions
while minimizing the nonpolar surface area exposed to the aqueous environment.

. Page 2

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Test Bank for Biochemistry, 10th Edition by Jeremy Berg

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