- 1. Collagen can be classified as a structural protein.
A) true
B) false
- 2. The protein that transports oxygen in the blood is hemoglobin
A) false
B) true
- 3. Amino acids that are not synthesized in the body but must be ingested with the diet are called __________ amino acids.
A) essential
B) amide
C) value
D) critical
- 4. A zwitterion of any amino acid has a net charge of __________.
A) 0
B) 1-
C) 2
D) 3
E) 1+
- 5. The isoelectric point for any amino acid is the pH at which the amino acid has a net charge of __________.
A) 0
B) 1-
C) 4
D) 2+
E) 2-
- 6. Hemoglobin is a transport protein.
A) False
B) True
- 7. Zwitterions have an overall positive charge
A) True
B) False
- 8. The dipeptide abbreviated as Gly-Lys is the same as the dipeptide abbreviated as Lys-Gly
A) true
B) false
- 9. The dipeptide abbreviated as Gly-Lys is the same as the dipeptide abbreviated as Lys-Gly
A) true
B) false
- 10. the peptide bonds between the amino acids is a
A) tertiary
B) secondary structure
C) quaternary
D) primary structure
- 11. The α helix of the secondary structure of a protein is held together by __________ between two widely separated parts of a protein chain.
A) hydrophobic interactions
B) disulfide bridges
C) salt bridges
D) hydrogen bonds
- 12. In the β-pleated sheet secondary structure of a protein, two or more amino acid sequences in separate parts of the protein are held together
A) in a double helix.
B) in a coil, by hydrogen bonding.
C) in random order, due to hydrophobic interactions.
D) in a zig-zag conformation, by hydrogen bonding.
- 13. The fibrous protein responsible for the structure of hair and wool is
A) cytoplasm
B) collagen
C) endorphin
D) keratin
- 14. Which R group would most likely be found in a hydrophobic area of the tertiary structure of a globular protein?
A) CH2OH
B) CH3
C) CH2COO-
- 15. A peptide bond contains which kind of functional group?
A) alcohol
B) ketone
C) carboxylic acid
D) amide
- 16. Which of the following shows all of the tripeptides that can be formed from one molecule each of lysine (Lys), threonine (Thr), and histidine (His)?
A) Lys-Thr-His
B) Lys-Thr-His, Lys-His-Thr, His-Thr-Lys, His-Lys-Thr, Thr-Lys-His, Thr-His-Lys
C) Lys-His-Thr, His-Thr-Lys, His-Lys-Thr, Thr-Lys-His, Thr-His-Lys
- 17. In the peptide Ser-Cys-Ala-Gly, the C-terminal end is
A) glycerine
B) alanine
C) glycine
D) serine
- 18. In a typical amino acid zwitterion, the carboxylate end is
A) negatively charged.
B) neutral.
C) attached to an amine.
D) soluble in a nonpolar solvent.
- 19. Bonus! Briefly explain what causes someone to have sickle cell anemia
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