1ST SEM (153 - 172) Flashcards
- Which of the following amino acids have a positively charged side chain at neutral pH?
Select one or more:
a. Arginine
b. Lysine
c. Glycine
d. Aspartate
e. Glutamate
a. Arginine
b. Lysine
154 Which of the following amino acids have a negatively charged side chain at neutral pH?
Select one or more:
a. Arginine
b. Alanine
c. Asparagine
d. Aspartate
e. Glutamate
d. Aspartate
e. Glutamate
155 Which of the following amino acids have sulfur-containing side chains?
Select one or more:
a. Histidine
b. Cysteine
c. Methionine
d. Proline
e. Valine
b. Cysteine
c. Methionine
156 Which amino acid has a guanidine group in its side chain?
Select one:
a. Histidine
b. Lysine
c. Tyrosine
d. Arginine
e. Tryptophan
d. Arginine
Which of the following amino acids have four carbon atoms?
Select one or more:
a. Aspartate
b. Threonine
c. Asparagine
d. Proline
a. Aspartate
b. Threonine
c. Asparagine
Which of the following amino acids have five carbon atoms? Select one or more:
a. Glutamate
b. Glutamine
c. Histidine
d. Proline
e. Glycine
a. Glutamate
b. Glutamine
d. Proline
Which of the following amino acids have six carbon atoms?
Select one or more:
a. Leucine
b. Isoleucine
c. Histidine
d. Proline
e. Glycine
a. Leucine
b. Isoleucine
c. Histidine
Which of the following amino acid side chains are nonpolar?
Select one or more:
a. Valine
b. Leucine
c. Asparagine
d. Lysine
a. Valine
b. Leucine
Which of the following amino acid side chains are polar?
Select one or more:
a. Glutamine
b. Leucine
c. Asparagine
d. Threonine
a. Glutamine
c. Asparagine
d. Threonine
Which of the following amino acid side chains are polar?
Select one or more:
a. Glutamine
b. Leucine
c. Asparagine
d. Threonine
a. Glutamine
c. Asparagine
d. Threonine
Pair the amino acids with their character!
- Proline 2. Arginine 3. Glutamate
a. neutral b. acidic c. basic
Select one:
a. 1-a, 2-c, 3-b
b. 1-a, 2-b, 3-c
c. 1-b, 2-c, 3-a
d. 1-b, 2-a, 3-c
e. 1-c, 2-a, 3-b
a. 1-a, 2-c, 3-b
Pair the amino acids with their character!
- Glutamine 2. Lysine 3. Aspartate
a. neutral b. acidic c. basic
Select one:
a. 1-a, 2-b, 3-c
b. 1-a, 2-c, 3-b
c. 1-b, 2-c, 3-a
d. 1-b, 2-a, 3-c
e. 1-c, 2-a, 3-b
b. 1-a, 2-c, 3-b
Select the correct statements!
Select one or more:
a. Acidic amino acids have a net negative charge at neutral pH.
b. The isoelectric point of acidic amino acids is at acidic pH.
c. The isoelectric point of the acidic amino acids can be calculated as the average of their three pKa values.
d. Asparagine is an acidic amino acid.
a. Acidic amino acids have a net negative charge at neutral pH.
b. The isoelectric point of acidic amino acids is at acidic pH.
Select the correct statements!
Select one or more:
a. Neutral amino acids have no net charge at neutral pH.
b. neutral amino acids have a positive and a negative charge at neutral pH.
c. The isoelectric point of the neutral amino acids can be calculated as the average of their pKa values.
d. Glutamine is a neutral amino acid.
a. Neutral amino acids have no net charge at neutral pH.
b. neutral amino acids have a positive and a negative charge at neutral pH.
c. The isoelectric point of the neutral amino acids can be calculated as the average of their pKa values.
d. Glutamine is a neutral amino acid.
Select the correct statements!
Select one:
a. Leucine has two asymmetrical centers.
b. Only D-amino acids can be found in proteins.
c. Natural amino acids are dextrorotatory.
d. Glycine has no chiral center.
e. Proline is not active optically.
d. Glycine has no chiral center.
What is the dominant form of Arginine at pH 6.0? (pKa values of Arginine are 2.2, 9.0 and 12.5).
Select one:
a. Two positive and one negative charges
b. One positive and two negative charges
c. One negative and one positive charges
d. One negative charge
e. One positive charge
a. Two positive and one negative charges
What is the dominant form of Glutamate at pH 7.0?
(pKa values of Glutamate are 2.2, 5.6 and 9.2).
Select one:
a. One negative charge
b. One negative and one positive charges
c. One positive and two negative charges
d. One positive charge
d. One positive charge
What is the dominant form of Histidine at pH 8.0? (pKa values of Histidine are 1.8, 6.0 and 9.2).
Select one:
a. One positive and one negative charges
b. Two negative and one positive charges
c. One negative charge
d. One positive charge
a. One positive and one negative charges
What is the dominant form of Glycine at low pH (pH=1)?
Select one:
a. NH2–CH2–COO-
b. NH3+–CH2–COOH
c. NH3+–CH2–COO-
d. NH2–CH2–COOH
e. NH2–CH3+–COO-
b. NH3+–CH2–COOH
Select the correct statements!
Select one or more:
a. Glutamate has a negative charge on its side chain at the isoelectric pH.
b. Glutamate has a negative charge on its side chain at neutral pH.
c. Arginine has a positive charge on its side chain at the isoelectric pH.
d. Arginine has a positive charge on its side chain at neutral pH.
b. Glutamate has a negative charge on its side chain at neutral pH.
c. Arginine has a positive charge on its side chain at the isoelectric pH.
d. Arginine has a positive charge on its side chain at neutral pH.
172 Lysine at its isoelectric point has….
Select one:
a. a deprotonated a-carboxyl group, a deprotonated–a-amino group and a protonated e-amino group.
b. a deprotonated a-carboxyl group, a protonated a-amino group and a deprotonated e-amino group.
c. a protonated a-carboxyl group, a protonated a-amino group and a deprotonated e-amino group.
d. a protonated a-carboxyl group, a deprotonated a-amino group and a protonated–e-amino group.
e. a deprotonated a-carboxyl group, a deprotonated a-amino group and a deprotonated e-amino group.
a. a deprotonated a-carboxyl group, a deprotonated–a-amino group and a protonated e-amino group.
