[سحر البيان]

تست بانك شابتر 25

1. A protein is

A. a polysaccharide.
B. a saturated ester of glycerol.
C. one of the units making up a nucleic acid.
D. a polymer of amino acids.
E. an aromatic hydrocarbon.


2. A peptide bond (also called an amide bond) joins two amino acids together. What atoms are linked by this bond?

A. C — O
B. C — H
C. C — N
D. N — S
E. S — C


3. An amino acid is a compound that contains at least

A. one amino group and one amide group.
B. two amino groups and one carboxylic acid group.
C. one hydroxyl group and one methyl group.
D. one carboxylic acid group and one amino group.
E. one methyl group and one amide group.


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