Amino Acids Flashcards

1
Q

20 amino acids found in peptides and proteins are what?

A

A-amino Acids

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2
Q

When a molecule has a (+) and (-) charge it is called a what?

A

Zwitterion

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3
Q

What is isoelectric point (pl)?

A

It is a pH at which the overall charge of an amino acid is neutral

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4
Q

All amino acids (except glycine) are?

A

Chiral

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5
Q

What is a D-amino acid?

A

They have amino group on right side when drawn as a Fisher projection

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6
Q

What is a L-amino Acids?

A

They have an amino group on the left

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7
Q

Glutamine is in which class of amino acid?

A) Nonpolar
B) Polar acidic
C) Polar basic
D) Polar neutral

A

Answer:D

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8
Q

What is a peptide bond?

A

Amidst bond joining two amino acids together

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9
Q

How many amino acids do proteins have?

A

Proteins can more than 50 amino acids

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10
Q

How many amino acids does oligopeptides have?

A

Oligopeptides contain 2 to 10 amino acids

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11
Q

How many amino acids does Polypeptides have?

A

Polypeptides have more than 10 amino acids

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12
Q

When drawing N-terminus what side is it on?

A

The left side

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13
Q

When drawing C-terminus what side is it on?

A

The right

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14
Q

True or false: Amink acid residues are listed in order from N- to C- terminus

A

True

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15
Q

True or false: both the snide and carboxylic acid portion of an amino acid are pH dependent

A

True

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16
Q
What is the overall charge of Arginine at pH 14?
A) +2
B) +1
C) 0
D) -1
A

Answer:D

17
Q

Proteins are classified as?

A

Fibrous and Globular

18
Q

Primary structure is?

A

The order of amino acids residues

19
Q

What are the 2 common types of secondary structure?

A

A-helix and B-sheet

20
Q

What does a a-helix resemble?

A

It resembles a coiled spring

21
Q

What does a b-helix form?

A

It forms when different segments of a polypeptide chain align side by side

22
Q

What is a parallel sheet?

A

Parallel sheets have all strands running in the same direction

23
Q

What is a tertiary structure?

A

Overall three-dimensional shape

24
Q

What is a hydrophobic effect?

A

No Polar portions of the protein that are drawn to one another creating pockets to avoid water

25
Q

What is a ionic bond?

A

It is a salt bridge between one positive and one negative charges side chain

26
Q
What is the monomer unit of a protein?
A) Amino Acids
B) Nucleic Acids
C) Monosaccharides 
D) Fatty Acids
A

Answer:A

27
Q
Biological function is largely dependent on what level of structural organization?
A) Primary
B)secondary 
C) Tertiary
D) None Of The above
A

Answer:C

28
Q

What is a quaternary structure?

A

Two or more polypeptide units associate to form a single 3D protein unit

29
Q

What are simple proteins?

A

They are a function without a prosthetic group

30
Q

What is a conjugated protein?

A

Require a prosthetic group

31
Q

What does a disulfide bridge react to?

A

It is s reaction between two cysteine residues

32
Q

what is involved in a peptide bond?

A

A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule

33
Q

What is a zwitter ion?

A

A zwitterion is a molecule having separate positively and negative charged groups

34
Q

What happens during hydrolysis ?

A

It is a chemical process in which a molecule is cleaved into two parts by the addition of a molecule of water. .