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Biochemistry Objective Questions { Structure and Properties of Amino Acids }



1. When the amino acid alanine (R-group is CH3) is added to a solution with a pH of 7.3, alanine becomes
A.a cation
B.nonpolar
C.a zwitterions
D.an isotope
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2. What is the end product of leucine metabolism?
A.Acetyl-CoA
B.Pyruvic acid
C.Oxaloacetic acid
D.Acetyl carnitine
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3. What is the heaviest of the twenty amino acids?
A.Phenylalanine
B.Tryptophan
C.Tyrosine
D.Histidine
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4. Which of the following amino acids can form hydrogen bonds with their side (R) groups?
A.Asparagine
B.Aspartic acid
C.Glutamine
D.All of these
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5. The isoelectric point of an amino acid is defined as the pH
A.where the molecule carries no electric charge
B.where the carboxyl group is uncharged
C.where the amino group is uncharged
D.of maximum electrolytic mobility
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6. Molecules that bear charged groups of opposite polarity are known as
A.zwitterions
B.ambions
C.ion conversion
D.amphions
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7. What is the product of the catabolic breakdown of Arginine?
A.Alpha-ketoglutarate
B.Fumarate
C.Oxaloacetate
D.Succinate
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