- 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) true
B) false
- 3. Amino acids that are not synthesized in the body but must be ingested with the diet are called __________ amino acids.
A) critical
B) amide
C) essential
D) value
- 4. A zwitterion of any amino acid has a net charge of __________.
A) 2
B) 0
C) 1+
D) 1-
E) 3
- 5. The isoelectric point for any amino acid is the pH at which the amino acid has a net charge of __________.
A) 4
B) 2-
C) 2+
D) 0
E) 1-
- 6. Hemoglobin is a transport protein.
A) True
B) False
- 7. Zwitterions have an overall positive charge
A) False
B) True
- 8. The dipeptide abbreviated as Gly-Lys is the same as the dipeptide abbreviated as Lys-Gly
A) false
B) true
- 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) quaternary
B) secondary structure
C) tertiary
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) hydrogen bonds
D) salt bridges
- 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 a zig-zag conformation, by hydrogen bonding.
D) in random order, due to hydrophobic interactions.
- 13. The fibrous protein responsible for the structure of hair and wool is
A) keratin
B) endorphin
C) cytoplasm
D) collagen
- 14. Which R group would most likely be found in a hydrophobic area of the tertiary structure of a globular protein?
A) CH3
B) CH2OH
C) CH2COO-
- 15. A peptide bond contains which kind of functional group?
A) carboxylic acid
B) alcohol
C) ketone
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-His-Thr, His-Thr-Lys, His-Lys-Thr, Thr-Lys-His, Thr-His-Lys
B) Lys-Thr-His, Lys-His-Thr, His-Thr-Lys, His-Lys-Thr, Thr-Lys-His, Thr-His-Lys
C) Lys-Thr-His
- 17. In the peptide Ser-Cys-Ala-Gly, the C-terminal end is
A) glycine
B) serine
C) alanine
D) glycerine
- 18. In a typical amino acid zwitterion, the carboxylate end is
A) negatively charged.
B) neutral.
C) soluble in a nonpolar solvent.
D) attached to an amine.
- 19. Bonus! Briefly explain what causes someone to have sickle cell anemia
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