Which of the following properties applies to a dispensable amino acid?
(A) It is not needed by the body.
(B) It can be synthesized by the body.
(C) It can be used to synthesize an indispensable amino acid.
(D) It cannot be synthesized by the body because of a genetic defect.
Answer : (B
Which of the following properties applies to a dispensable amino acid?
(A) It is not needed by the body.
(B) It can be synthesized by the body.
(C) It can be used to synthesize an indispensable amino acid.
(D) It cannot be synthesized by the body because of a genetic defect.
Answer : (B)
Which of the following is the primary factor that differentiates one amino acid from another?
(A) the side group
(B) the central carbon atom
(C) the number of oxygen atoms
(D) the number of nitrogen atoms
Answer : (A)
Which of the following elements is found in certain amino acids?
(A) iron
(B) sulphur
(C) calcium
(D) potassium
Answer : (B)
Which amino acid is classified as conditionally essential when dietary intake of phenylalanine
is insufficient or the body cannot normally metabolize phenylalanine?
cysteine
tyrosine
glutamine
, isoleucine
Answer : (B)
How is an essential amino acid distinguished from a nonessential amino acid?
(A) It has a branched chain in its side group.
(B) It can be made in the body only if a source of nitrogen is present.
(C) It is required to make body proteins.
(D) It must be supplied by the diet.
Answer : (D)
What is the name of the bond between two amino acids?
(A) peptide bond
(B) amino bond
(C) glycine-alanine bond
(D) amino acid sequence bond
,Answer : (A)
Which of the following is a description of the tertiary structure of a protein?
the size of the polypeptide chain
the order of the amino acids in a sequence
the folds and twists in a polypeptide chain
the multiple polypeptide interactions in a protein
Answer : (C)
Which of the following factors determines the amino acid sequence of a protein?
(A) number of side chains in the protein
(B) folding arrangement of the peptide chain
(C) order of amino acids in the peptide chain
(D) order of only the essential amino acids in the protein
Answer : (C)
In comparison to the well-defined structure of starch, which of the following is the most
important factor that allows for the synthesis of thousands of different proteins?
number of cell ribosomes
number of different combinations of amino acids
availability of amino acids containing sulphur
availability of amino acids containing hydroxyl groups
Answer : (B)
Which of the following, when bonded together, would form a polypeptide?
(A) 1 amino acid, 2 fatty acids, and a glycerol molecule
(B) 5 different amino acids
(C) 3 of the same amino acids
(D) any 20 amino acids
, Answer : (D)
The following amino acids are linked together: glycine-lysine-valine. This compound is
which of the following peptides?
a dipeptide
a tripeptide a
polypeptide an
oligopeptide
Answer : (B)
Which of the following distinguishes hemoglobin from a polypeptide chain?
(A) Hemoglobin is a tertiary structure.
(B) Hemoglobin is denatured.
(C) Hemoglobin is a complex of four polypeptide chains.
(D) Hemoglobin contains a globin molecule within the heme structure.
Answer : (C)
Which of the following structures results from the weak electrical attractions within a
polypeptide?
primary structure
secondary structure
tertiary structure
quaternary structure
Answer : (B)
Which of the following is an example of a protein with a quaternary polypeptide structure?
(A) insulin
(B) tryptophan
(C) hemoglobin
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