Lecture 3: Amino Acids Flashcards

1
Q

Ionization state of amino acids varies with

A

PH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Amino acids are the building blocks of

A

proteins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

CORN Law

A

Look at the H-Ca bonf and see, if clockwise CO R N then it is L isomer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

D isomer of amino acid

A
  • This form would not be a unit of a protein in the natural world
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Zwitterion form

A

Under neutral conditions, the amino acid will exist in its zwitterion form. A zwitterion is a molecule that contains both a positive and a negative charge. For the zwitterion amino acid, the negative charge comes from the carboxylate ion while the positive charge comes from the ammonium ion.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Zwitterionic form predominates at

A

PH 7.4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

All forms of life use a common set of — amino acids to build proteins

A

20

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Each amino acid difers by its

A

Side chain (R group)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Side chains contain different —- with different —–

A
  • functional groups
  • chemical properties
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Glycine’s R group is a —- so it is —- —-

A
  • hydrogen
  • not chiral
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Alanine’s R group is a —- group

A

methyl

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Isoleucine is a —- —- of leucine

A

Constitutional isomer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Secondary amine (2)

What it is + who is included

A
  • 5 membered ring
  • proline
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The amino acids are all chiral, with the exception of —, whose side chain is —.

A
  • glycine
  • H
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Methionine has a —- group but not at the end and therefore —–

A
  • sulfur group
  • less reactive
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The amino acids that are hydrophobic, because of their R groups are often found

A

away from water when part of a protein

17
Q

Cysteine has a —- group at the end where it is reactive

A

thiol

18
Q

Which amino acid is classified as “polar” because of the electronegative groups in their “R” groups? (6)

A
  • Serine
  • Threonine
  • Tyrosine
  • Cysteine
  • Asparagine
  • Glutamine
19
Q

Cysteine is often considered a

A

hydrophobic amino acid

20
Q

These amino acids have “R” groups that are generally negatively charged (2)

A
  • Asparatate
  • Glutamate
21
Q

guanidinium

A
22
Q

Which amino acid has guanidinium?

A
  • Arginine
23
Q

Arginine, lysine and Histidine is generally —-

A

protonated

24
Q

Lysine, arginine, and histidine are —- charged at neutral pH.

A

positively

25
Q

which of the 20 amino acid lacks a primary amine?

A

proline