BIO 156 EXAM 2 QUESTIONS AND ANSWERS
ALREADY GRADED A+
1. The side chain (R group) of the amino acid serine is -CH2-OH. The side chain of the
amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino
acids in a globular protein in aqueous solution?
Answer: Serine would be on the exterior, and leucine would be in the interior of the globular protein.
2. The structural level of a protein leastaffected by a disruption in hydrogen bonding is
the
Answer: primary level.
3. The tertiary structure of a polypeptide is the
Answer: overall three-dimensional shape of a fully
folded polypeptide.
4. Which bond is a peptide bond?
Answer: C. O = C--N--H
5. During the synthesis of a polypeptide the next amino acid in the growing polymer is
added to which functional group shown ?
, Answer: C. O = --C--O--H
6. How many peptide bonds are present in a polypeptide that contains 45 amino
acids?
Answer: 44
7. At which bond in the figure would water need to be added to achieve hydrolysis of
the dipeptide, back to its component amino acids?
Answer: C. O = C--N--H
8. What maintains the secondary structure of a protein?
Answer: hydrogen bonds between the
amino group of one peptide bond and the carboxyl group of another peptide bond
9. Which molecule shown in Figure 3.6 contains an amino functional group, but is not an
amino acid?
Answer: A 3H--C--N--2H
10. Which two functional groups shown are present in all amino acids?
Answer: C and D.
--O=C--O--H and -NH2
11. What is the name of part f and what is it used for?
Answer: Fine Adjustment knob to move the stage up and down in small increments
12. What is the name of part d and what is it used for?
ALREADY GRADED A+
1. The side chain (R group) of the amino acid serine is -CH2-OH. The side chain of the
amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino
acids in a globular protein in aqueous solution?
Answer: Serine would be on the exterior, and leucine would be in the interior of the globular protein.
2. The structural level of a protein leastaffected by a disruption in hydrogen bonding is
the
Answer: primary level.
3. The tertiary structure of a polypeptide is the
Answer: overall three-dimensional shape of a fully
folded polypeptide.
4. Which bond is a peptide bond?
Answer: C. O = C--N--H
5. During the synthesis of a polypeptide the next amino acid in the growing polymer is
added to which functional group shown ?
, Answer: C. O = --C--O--H
6. How many peptide bonds are present in a polypeptide that contains 45 amino
acids?
Answer: 44
7. At which bond in the figure would water need to be added to achieve hydrolysis of
the dipeptide, back to its component amino acids?
Answer: C. O = C--N--H
8. What maintains the secondary structure of a protein?
Answer: hydrogen bonds between the
amino group of one peptide bond and the carboxyl group of another peptide bond
9. Which molecule shown in Figure 3.6 contains an amino functional group, but is not an
amino acid?
Answer: A 3H--C--N--2H
10. Which two functional groups shown are present in all amino acids?
Answer: C and D.
--O=C--O--H and -NH2
11. What is the name of part f and what is it used for?
Answer: Fine Adjustment knob to move the stage up and down in small increments
12. What is the name of part d and what is it used for?
