BIOCHEMISTRY FINAL TEST BANK EXAM

BIOCHEMISTRY FINAL TEST BANK EXAM

2025 WITH 400 PREP QUESTIONS AND

WELL-VERIFIED CORRECT ANSWERS |

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ACTUAL EXAM 2025 [BRAND NEW]

Which of the following molecules would be prevented from readily crossing a lipid bilayer?

• glucose
• sodium ions
• potassium ions
• water
• all of the above - ANSWER- E) all of the above

In an aqueous solution, if the [OH-] is 3.0×10-5M, what is the [H+]?

A) 7.0×10^-9

B) 7.0×10^-2

C) 3.3×10^-3

D) 3.3×10^-10

• none of the above - ANSWER- D) 3.3×10^-10

Which of the following would be the strongest acid? 1 / 4

• formic acid, pK=3.75
• succinic acid, a diprotic acid with pK=4.21 and 5.64
• acetic acid, pK=4.76
• ammonium ion, pK=9.25
• cannot be determined from the given information - ANSWER- A) formic acid,

pK=3.75

What is the pH of a solution that contains three parts of acetic acid and one part sodium acetate? The pKfor acetic acid is 4.76.

A) 5.24

B) 5.06

C) 4.46

D) 4.28

• cannot be determined from the given information - ANSWER- D) 4.28

What is the conjugate acid of H2PO4-?

A) HPO4^2-

B) H2PO4

C) H3PO4

D) PO4^3-

• none of the above - ANSWER- C) H3PO4

Considering a 0.1 M formic acid buffer, what is the concentration of formic acid present in a solution of pH 4.25 if the pK of formic acid is 3.75?

A) 0.024 M

B) 0.033 M 2 / 4

C) 0.067 M

D) 0.076 M

• none of the above - ANSWER- A) 0.024 M

Which of the following shows the buffer that is found in the bloodstream?

• H3PO4 <----> H2PO4^2-+ H+
• H2PO4- <----> HPO4^2-+ H+
• HPO4^2- <----> PO4^3-+ H+
• H2CO3 <----> HCO3-+ H+
• HCO^3- <----> CO3^2-+ H+ - ANSWER- D) H2CO3 <----> HCO3-+ H+

If a phosphate buffer (pK=6.82) was formulated such that its pH was 7.3, it would be best suited to buffer against _____. If instead, it was formulated such that its pH was 6.3, it would be best suited to buffer against _____.

• acid; base
• acid; acid
• base; acid
• base; base
• a buffer with a pH that far from the pK would not be an effective buffer -

ANSWER- A) acid; base What term is used to describe the exclusion of nonpolar substances from an aqueous solution?

• nonpolar effect
• lipid effect
• hydrophobic effect
• oil droplet effect 3 / 4

• amphiphilic effect - ANSWER- C) hydrophobic effect

Which of the following explains the attractive forces between hydrophobic molecules in an aqueous solution?

• in an aqueous environment, London dispersion forces between hydrophobic

molecules become stronger

• in an aqueous environment, London dispersion forces between hydrophobic

molecules and water becomes stronger

• since nonpolar molecules do not form hydrogen bonds with hydrogen bonds

with water, they can form hydrogen bonds with other nonpolar molecules

• there is no increase in attractive forces between nonpolar molecules in an

aqueous environment

• none of the above - ANSWER- D) there is no increase in attractive forces

between nonpolar molecules in an aqueous

Considering the energetics of transferring nonpolar molecules from water to a nonpolar solvent, the factor TdeltaS is generally _____, causing deltaG to be _____.

• positive; negative
• negative; negative
• positive; positive
• positive; positive
• negligible; either positive or negative - ANSWER- A) positive; negative
• / 4