Multiple Choice
The primary building blocks (monomers) of proteins are:
a) Glucose molecules.
b) Lipids.
c) Nucleotides.
d) Amino acids.
e) None of these.
4. Biomolecules
Proteins
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Which of the following is true of protein structure?
a) Peptide bonds are formed by hydrolysis.
b) Peptide bonds join the amine group on one amino acid with the R group of another amino acid.
c) Secondary protein structures are caused by hydrogen bonding between atoms of the peptide backbone.
d) Tertiary protein structure emerges when there is more than one polypeptide in a protein.
A
Peptide bonds are formed by hydrolysis.
B
Peptide bonds join the amine group on one amino acid with the R group of another amino acid.
C
Secondary protein structures are caused by hydrogen bonding between atoms of the peptide backbone.
D
Tertiary protein structure emerges when there is more than one polypeptide in a protein.
Verified step by step guidance1
Understand the levels of protein structure: primary, secondary, tertiary, and quaternary. Each level has distinct characteristics and bonds.
Recognize that peptide bonds are formed by a dehydration synthesis reaction, not hydrolysis. Hydrolysis breaks bonds, while dehydration synthesis forms them.
Identify that peptide bonds specifically join the carboxyl group of one amino acid to the amine group of another, not the R group.
Learn that secondary protein structures, such as alpha helices and beta sheets, are stabilized by hydrogen bonds between the backbone atoms (not the R groups) of the polypeptide chain.
Clarify that tertiary structure refers to the overall 3D shape of a single polypeptide chain, stabilized by interactions between R groups, while quaternary structure involves multiple polypeptide chains.
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