Question :
41) Within hemoglobin, the heme functions as
A) a disulfide bridge.
B) : 1324970
41) Within hemoglobin, the heme functions as
A) a disulfide bridge.
B) an oxygen carrier.
C) a reducing agent.
D) an α subunit.
E) one of the four protein subunits.
42) Hemoglobin has a total of __________ protein chains in its quaternary structure.
A) one
B) two
C) three
D) four
E) five
43) The fibrous protein responsible for the structure of hair and wool is
A) keratin.
B) collagen.
C) endorphin.
D) myosin.
E) casein.
44) Which R group would most likely be found in a hydrophobic area of the tertiary structure of a globular protein?
A) -CH2OH
B) – CH2COO-
C)
D) – CH2CH2CH2CH2H3
E)
45) What type of interaction would you expect between the following R groups in the tertiary structure of a protein?
A) disulfide bonds
B) salt bridges
C) hydrogen bonds
D) hydrophobic interactions
E) peptide bonds
46) Disulfide bonds in a protein chain connect
A) an amine and a carboxylic acid group.
B) an alcohol and a carboxylic acid group.
C) tryptophan and alanine residues.
D) two cysteine residues.
E) two asparagine residues.
47) What kinds of interactions are NOT part of tertiary protein structure?
A) peptide bonds
B) disulfide bonds
C) hydrophilic interactions
D) salt bridges
E) hydrophobic interactions
48) The function of myoglobin is to
A) carry vitamins in the blood.
B) carry oxygen in the blood.
C) support the skeletal muscles.
D) carry oxygen in the muscle.
E) provide strength in cartilage.
49) In sickle-cell anemia, the hemoglobin molecules
A) come apart into separate chains.
B) enlarge to twice normal size.
C) clump together into insoluble fibers.
D) dissolve in the plasma.
E) undergo crenation.
50) Acids and bases denature a protein by disrupting
A) peptide bonds and ionic bonds.
B) amide bonds and alkene bonds
C) hydrophobic interactions and peptide bonds.
D) ionic bonds and hydrophobic interactions.
E) ionic bonds and hydrogen bonds.
51) Heat denatures a protein by disrupting
A) ionic bonds and peptide bonds.
B) hydrophobic bonds and hydrogen bonds.
C) peptide bonds and hydrophobic bonds.
D) disulfide bonds and peptide bonds.
E) hydrogen bonds and disulfide bonds.
52) Denaturation of a protein
A) changes the primary structure of a protein.
B) disrupts the secondary, tertiary, or quaternary structure of a protein.
C) is always irreversible.
D) hydrolyzes peptide bonds.
E) can only occur in a protein with quaternary structure.
53) One heavy metal that can cause denaturation of a protein is
A) silver.
B) sodium.
C) barium.
D) iron.
E) calcium.
54) Heavy metals denature proteins by
A) releasing amino acids.
B) disrupting hydrophobic interactions.
C) changing the pH of the protein solution.
D) changing the temperature of the protein solution.
E) disrupting disulfide bonds.
55) An acid can denature a protein by
A) agitating the protein chains.
B) disrupting hydrogen bonds between R groups chains.
C) disrupting hydrophobic interactions within a protein chain.
D) removing helping molecules such as heme.
E) breaking disulfide bridges.
