Choose the amino acid that *does NOT* function as a neurotransmitter.
A. Glutamic acid
B. Glycine
C. Tyrosine
D. Lysine
E. Cysteine - ANS Glycine -- it doesn't have an R group so it can't interact with anything
The three-dimensional structure of a protein is determined primarily by:
A. electrostatic guidance from nucleic acid structure.
B. how many amino acids are in the protein.
C. hydrophobic interaction with lipids that provide a folding framework.
D. modification during interactions with ribosomes
E. the sequence of amino acids in the protein - ANS E. the sequence of amino acids in the
protein
Determine the net charge of the following tetrapeptide at pH 3 that contains the amino acids
represented by the single letters "KYLE", such that K is at the amino-terminal end of the peptide
and E is at the carboy-terminal end.
A. +2
B. +1
C. 0
D. -1
E. -2 - ANS +1
What is the isoelectric point of the following tetrapetide that contains the amino acids
represented by the single letters "DREN", such that D is at the amino-terminal end of the
peptide and N is at the carboy-terminal end.
A. 3.86
B. 4.06
C. 6.53
D. 8.8
E. 12.48 - ANS 4.06
The three-dimensional structure of a protein is determined primarily by:
A. electrostatic guidance from nucleic acid structure.
B. how many amino acids are in the protein.
C. hydrophobic interaction with lipids that provide a folding framework.
D. modification during interactions with ribosomes
E. the sequence of amino acids in the protein - ANS the sequence of amino acids in the protein
,The enzyme fumarase catalyzes the reversible hydration of fumaric acid to l-malate, but it will
not catalyze the hydration of maleic acid, the cis isomer of fumaric acid. This is an example of:
A. biological activity.
B. chiral activity.
C. racemization.
D. stereoisomerization.
E. stereospecificity. - ANS stereospecificity
If the free energy change ΔG for a reaction is -46.11 kJ/mol, the reaction is:
A. at equilibrium.
B. endergonic.
C. endothermic.
D. exergonic.
E. exothermic. - ANS exergonic
Which of the following amino acids contain a hydrophobic side chain
A. Leucine
B. Arginine
C. Glutamine
D. Glutamic acid
E. Aspartic acid - ANS Leucine
Local folding of a protein occurs at what defined level of protein folding?
A. Primary
B. Secondary
C. Tertiary
D. Quarternary
E. All of the above - ANS Secondary
Biological machines are derived from which class of compounds
A. Fats
B. Proteins
C. Carbohydrates
D. Ribosomes
E. B and C - ANS Proteins
Choose the amino acid that *does NOT* function as a neurotransmitter.
A. Glutamic acid
B. Glycine
C. Tyrosine
D. Lysine
E. Cysteine - ANS Glycine
, Which of the following is a function of proteins?
A) Defense
B) Metabolic regulation
C) Transport
D) Catalysis
E) All of the above are correct - ANS All of the above are correct
The term protein refers to amino acid polymers with greater than ________amino acids.
A) 10
B) 20
C) 50
D) 70
E) 90 - ANS 50
Which of the following is a nonstandard amino acid?
A) Glycine
B) Cysteine
C) 5-Hydroxyproline
D) Valine
E) Alanine - ANS 5-Hydroxyproline
Which of the following is a heterocyclic amino acid?
A) Alanine
B) Valine
C) Proline
D) Tyrosine
E) Cystine - ANS Proline
Which of the following is not a class of amino acid?
A) Nonpolar and neutral
B) Polar and neutral
C) Acidic
D) Basic
E) Asymmetric - ANS Asymmetric
Which of the following amino acids lacks a center of asymmetry?
A) Alanine
B) Glycine
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