,Name: Class: Date:
Chap 02_9e
Indicate whether the statement is true or false.
1. The amount of free energy released when bonds are broken during a reaction is higher when the molecule
has more electronegative atoms.
a. True
b. False
Indicate the answer choice that best completes the statement or answers the question.
2. The ultimate source of energy used to make ATP for all cells is:
a. electricity.
b. heat.
c. light.
d. magnetism.
3. Which of the following is true about an observed change in free energy (ΔG)?
a. Free energy was created when the Big Bang occurred
b. It can be calculated from the total change in energy, temperature, and change in entropy.
c. If a reaction's free energy is greater than zero, it is likely to happen spontaneously.
d. Free energy is comparable to unusable energy.
4. The pKa of the weak base NH3 is 9.25. When present in lysosomes, a subcellular organelle—ammonia—is alm
totally protonateD) Which of the pH values listed below is most likely to be that of the lysosome lumen?
a. 1
b. 5
c. 8
d. 14
5. An Archaea cell living in an abandoned mine is found to contain a very high concentration of protons. It is likely th
this cell:
a. has a high ph and is acidic
b. has a high ph and is alkaline.
c. has low ph and is acidic
d. has a low pH and is alkaline.
6. What is [P]/[R] when ΔG =ΔG°´?
a. –1
b. 0
c. 1
d. 2.3
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,Name: Class: Date:
Chap 02_9e
7. Hydrolysis of ATP:
a. is endothermic
b. has a positive ΔG value.
c. must be coupled to an energetically favorable reaction.
d. none of the above
8. In the reaction NAD+ + H+ + 2e−→ NADH, NAD+ becomes:
a. dehydrated
b. hydrolyzed
c. oxidized
d. reduced
9. Which of the following is NOT one of the ways RNA differs from DNA?
a. Ribonucleotides have a hydroxyl group on the 2 carbon of their sugar subunit.
b. Ribonucleotides can have enzymatic activity.
c. Ribonucleotides contain a phosphate group.
d. Ribonucleotides can contain the base uracil.
10. A reaction with a positive ΔG value can be made energetically favorable by increasing the:
a. ΔG°'.
b. starting concentration of products.
c. starting concentration of reactants.
d. The first two answers are correct.
11. NAD+ and FAD are often referred to as:
a. redox proteins.
b. polymers.
c. reduced dinucleotides.
d. electron-carrying coenzymes.
12. Which of the following is a monosaccharide?
a. fructose
b. galactose
c. glucose
d. all of the above
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, Name: Class: Date:
Chap 02_9e
13. When two atoms differing in electronegativity are joined in a covalent bond, then the:
a. electrons are shared equally between the atoms.
b. bond is nonpolar.
c. resulting compound is devoid of any dipole moment.
d. atom with the greater electronegativity attracts the bonded electrons more strongly.
14. Which of the following is the strongest interaction?
a. hydrogen bond
b. ionic bond
c. phosphoanhydride bond
d. van der Waals interaction
15. Which of the following is a noncovalent interaction?
a. hydrophobic effect
b. ionic interactions
c. van der Waals interactions
d. all of the above
16. Which of the following is/are a hydrophilic amino acid?
a. alanine
b. leucine
c. tryptophan
d. serine
17. Based on what you know about hydrophobic interactions, which of the following is/are composed of a bilayer?
a. a cell’s membrane
b. spontaneously aggregated phospholipids surrounding an aqueous interior
c. lipid vesicles that have budded off the cell’s membrane
d. all of the above
18. For the binding reaction A + B ➝ AB, the dissociation constant is equal to:
a. [AB]/([A]+[B])
b. ([A] + [B])/[AB].
c. Keq
d. The first and third answers are correct.
19. Covalent bonds between which of the following pairs of atoms are nonpolar?
a. C–C
b. C–H
c. O–H
d. A and B
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Chap 02_9e
Indicate whether the statement is true or false.
1. The amount of free energy released when bonds are broken during a reaction is higher when the molecule
has more electronegative atoms.
a. True
b. False
Indicate the answer choice that best completes the statement or answers the question.
2. The ultimate source of energy used to make ATP for all cells is:
a. electricity.
b. heat.
c. light.
d. magnetism.
3. Which of the following is true about an observed change in free energy (ΔG)?
a. Free energy was created when the Big Bang occurred
b. It can be calculated from the total change in energy, temperature, and change in entropy.
c. If a reaction's free energy is greater than zero, it is likely to happen spontaneously.
d. Free energy is comparable to unusable energy.
4. The pKa of the weak base NH3 is 9.25. When present in lysosomes, a subcellular organelle—ammonia—is alm
totally protonateD) Which of the pH values listed below is most likely to be that of the lysosome lumen?
a. 1
b. 5
c. 8
d. 14
5. An Archaea cell living in an abandoned mine is found to contain a very high concentration of protons. It is likely th
this cell:
a. has a high ph and is acidic
b. has a high ph and is alkaline.
c. has low ph and is acidic
d. has a low pH and is alkaline.
6. What is [P]/[R] when ΔG =ΔG°´?
a. –1
b. 0
c. 1
d. 2.3
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,Name: Class: Date:
Chap 02_9e
7. Hydrolysis of ATP:
a. is endothermic
b. has a positive ΔG value.
c. must be coupled to an energetically favorable reaction.
d. none of the above
8. In the reaction NAD+ + H+ + 2e−→ NADH, NAD+ becomes:
a. dehydrated
b. hydrolyzed
c. oxidized
d. reduced
9. Which of the following is NOT one of the ways RNA differs from DNA?
a. Ribonucleotides have a hydroxyl group on the 2 carbon of their sugar subunit.
b. Ribonucleotides can have enzymatic activity.
c. Ribonucleotides contain a phosphate group.
d. Ribonucleotides can contain the base uracil.
10. A reaction with a positive ΔG value can be made energetically favorable by increasing the:
a. ΔG°'.
b. starting concentration of products.
c. starting concentration of reactants.
d. The first two answers are correct.
11. NAD+ and FAD are often referred to as:
a. redox proteins.
b. polymers.
c. reduced dinucleotides.
d. electron-carrying coenzymes.
12. Which of the following is a monosaccharide?
a. fructose
b. galactose
c. glucose
d. all of the above
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, Name: Class: Date:
Chap 02_9e
13. When two atoms differing in electronegativity are joined in a covalent bond, then the:
a. electrons are shared equally between the atoms.
b. bond is nonpolar.
c. resulting compound is devoid of any dipole moment.
d. atom with the greater electronegativity attracts the bonded electrons more strongly.
14. Which of the following is the strongest interaction?
a. hydrogen bond
b. ionic bond
c. phosphoanhydride bond
d. van der Waals interaction
15. Which of the following is a noncovalent interaction?
a. hydrophobic effect
b. ionic interactions
c. van der Waals interactions
d. all of the above
16. Which of the following is/are a hydrophilic amino acid?
a. alanine
b. leucine
c. tryptophan
d. serine
17. Based on what you know about hydrophobic interactions, which of the following is/are composed of a bilayer?
a. a cell’s membrane
b. spontaneously aggregated phospholipids surrounding an aqueous interior
c. lipid vesicles that have budded off the cell’s membrane
d. all of the above
18. For the binding reaction A + B ➝ AB, the dissociation constant is equal to:
a. [AB]/([A]+[B])
b. ([A] + [B])/[AB].
c. Keq
d. The first and third answers are correct.
19. Covalent bonds between which of the following pairs of atoms are nonpolar?
a. C–C
b. C–H
c. O–H
d. A and B
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