Deck 3: Amino Acids

Question 1

The charge of glycine when the pH is < 2.0 is __________.

Answer 1

+1

Question 2

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: Another name for dipolar molecules.

Answer 2

d

Question 3

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: The amino acid with a sulfhydryl side chain.

Answer 3

h

Question 4

The amino acid that contains a weakly acidic "phenolic" group is __________.

Question 5

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: The amino acid with the abbreviation Ser.

Question 6

The group of amino acids that can be supplied by an organism under a defined condition are the ______ amino acids.

Question 7

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: Disulfide bonds are formed by pairs of this amino acid.

Question 8

____________ is often seen in a child with a protein-deficient diet.

Question 9

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________:The amino acid with whose side group has a terminal carboxamide.

Question 10

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: An amino acid that must be supplied by the diet.

Question 11

The ____________ group is the functional group that makes an amino acid more reactive than nonpolar amino acids such as valine, alanine, and phenylalanine.

Question 12

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: Chiral type of amino acids found in proteins.

Question 13

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: The amino acid with a pKa near neutral pH.

Question 14

The amino acid with an indol ring is __________.

Question 15

__________ is an amino acid with a hydrophobic side chain containing a thioether.

Question 16

__________ are amino acids with neutral R groups containing an electronegative atom that hoards electrons.

Question 17

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: The amino acid with an imidazole side chain.

Question 18

The amino acid with the smallest-size side chain allowing greatest flexibility in a protein is __________.

Question 19

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) L amino acids
b) water
c) protons
d) zwitterions
e) leucine
f) serine
g) tyrosine
h) cysteine
i) glutamate
j) histidine
k) proline
l) asparagine
m) D amino acids
____________: The amino acid with a negatively charged side chain at neutral pH.

Question 20

Between the amino and the carboxyl functional group, the ________ has the lowest affinity for a proton.

Question 21

Which of the following amino acids would most likely be soluble in a nonpolar solvent such as benzene?

A) valine
B) histidine
C) glutamine
D) glycine
E) All of the above.

Question 22

Why is the central carbon on an amino acid so important?

Question 23

In what pH range is zwitterionic alanine the predominate structure?

A) 0-2
B) 9-14
C) 8-10
D) 2-4
E) 2-9

Question 24

Which amino acids contain reactive aliphatic hydroxyl groups?

A) serine and methionine
B) serine and threonine
C) methionine and threonine
D) cysteine and methionine
E) cysteine and threonine

Question 25

Which amino acid side chains are capable of ionization?

Question 26

Name three amino acids that are positively charged at a neutral pH.

A) lysine and arginine
B) histidine and arginine
C) cysteine and arginine
D) lysine and proline
E) glutamine and histidine

Question 27

Interactions between side chains of and Aspartate and Arginine at neutral pH would be?

A) hydrophobic
B) ionic
C) hydrogen bonding
D) steric
E) covalent

Question 28

Which amino acid has a carboxyl group in its side chain?

A) glutamine
B) galanine
C) cysteine
D) glutamate
E) None of the above.

Question 29

The overall charge of a peptide of the following peptide sequence at pH 1 would be (Asp-Gly-Arg-His):

A) −1
B) 0
C) 1
D) 2
E) 3

Question 30

Draw the structure of alanine, aspartic acid, and histidine when the pH is 1.0, 7.0, and 12.0.

Question 31

Draw the general structure of an amino acid at pH 7.0 with the side group shown as an "R."

Question 32

What is the advantage of having multiple functional groups in proteins?

Question 33

What is the net charge of each amino acid for each of the cases in the question above?

Question 34

What charged group(s) is/are present in glycine at a pH of 7?

A) -NH3+
B) -COO-
C) -NH2+
D) A and B
E) A, B, and C

Question 35

What are the four ways amino acids can be classified?

Question 36

What is the advantage of protein interaction and assembly with other proteins?

Question 37

What are the three aromatic amino acids?

Question 38

Which amino acid has a side chain with a hydroxyl group?

A) serine
B) alanine
C) tryptophan
D) histidine
E) glutamine

Question 39

A gene is mutated such that the amino acids glycine and glutamate are now alanine and leucine, respectively.What are the potential results of each of these mutations? Assume that the mutations are not near each other in the primary sequence and have no impact on the other.

Question 40

At a pH of 12, what charged group(s) is/are present in glycine?

A) -NH3+
B) -COO-
C) -NH2+
D) A and B
E) A, B, and C

Question 41

What is the difference between nonessential and essential amino acids?

Question 42

Which ionizable group has the lowest affinity for protons: the terminal ɑ-carboxyl group, the aspartic acid side group, or the terminal ɑ-amino group?

Question 43

Why does this happen?

Question 44

Which amino acid is responsible for stabilizing the stucture of a protein by forming pairs of sulfhydryl groups?

Question 45

Which amino acids have a side chain that includes a modified carboxyl group, carboxaminde?

Question 46

What functions make histadine an important amino acid?

Question 47

List the essential amino acids.

Question 48

Which are the branched amino acids and what impact do they have on protein shape?

Question 49

Serine, threonine and tyrosine all have what in common?