Each amino acid differs from others only by the a

26) Each amino acid differs from others only by the
A) size of its amino group.
B) number of central carbon atoms.
C) number of peptide bonds in the molecule.
D) characteristic of its R group.
E) number of its carboxyl groups.
Answer: D
27) Hydrogen bonding between the amino hydrogen of one amino acid and the carboxyl oxygen of another is
responsible for which of the following?
28) An acid is a molecule that acts as a(n)
29) Ketoacids (a carboxylic acid group attached to a ketone) are often produced during fasting and uncontrolled
diabetes mellitus. What potential outcome of this would be of greatest concern?
30) The ________ structure of a protein is formed between residual (R) groups of the amino acid backbone by a
number of different chemical interactions, dependent upon the nature of the residual groups interacting.
A) primary B) secondary C) tertiary D) quaternary E) quinary
Answer: C
31) Which of the following is an example of a fibrous protein?
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32) ________ are molecules that are composed of one or more phosphate groups, a 5-carbon sugar, and a
nitrogenous base.

33) Why are nucleotides (and their polymers) called nucleic acids when they contain nitrogenous bases?
34) When the body needs to make the eicosanoid thromboxane for wound repair, what component of the plasma
membrane does it use for their synthesis?
A) glycolipid
B) fatty acid from phospholipid
C) ATP
D) transmembrane glycoprotein
E) cholesterol
Answer: B
35) Which of the following is/are found in DNA but not RNA?
36) All of the following are basic components of proteins EXCEPT
37) Which of the following molecule types is NOT a polymer?
38) Which of the following is NOT a base in RNA?
A) adenine B) cytosine C) thymine D) uracil E) guanine
Answer: C
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