Amino Acids

Question 1

20 amino acids found in peptides and proteins are what?

Answer 1

A-amino Acids

Question 2

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

Answer 2

Zwitterion

Question 3

What is isoelectric point (pl)?

Answer 3

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

Question 4

All amino acids (except glycine) are?

Answer 4

Chiral

Question 5

What is a D-amino acid?

Answer 5

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

Question 6

What is a L-amino Acids?

Answer 6

They have an amino group on the left

Question 7

Glutamine is in which class of amino acid?

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

Answer 7

Answer:D

Question 8

What is a peptide bond?

Answer 8

Amidst bond joining two amino acids together

Question 9

How many amino acids do proteins have?

Answer 9

Proteins can more than 50 amino acids

Question 10

How many amino acids does oligopeptides have?

Answer 10

Oligopeptides contain 2 to 10 amino acids

Question 11

How many amino acids does Polypeptides have?

Answer 11

Polypeptides have more than 10 amino acids

Question 12

When drawing N-terminus what side is it on?

Answer 12

The left side

Question 13

When drawing C-terminus what side is it on?

Answer 13

The right

Question 14

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

Answer 14

True

Question 15

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

Answer 15

True

Question 16

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

Answer 16

Answer:D

Question 17

Proteins are classified as?

Answer 17

Fibrous and Globular

Question 18

Primary structure is?

Answer 18

The order of amino acids residues

Question 19

What are the 2 common types of secondary structure?

Answer 19

A-helix and B-sheet

Question 20

What does a a-helix resemble?

Answer 20

It resembles a coiled spring

Question 21

What does a b-helix form?

Answer 21

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

Question 22

What is a parallel sheet?

Answer 22

Parallel sheets have all strands running in the same direction

Question 23

What is a tertiary structure?

Answer 23

Overall three-dimensional shape

Question 24

What is a hydrophobic effect?

Answer 24

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

Question 25

What is a ionic bond?

Answer 25

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

Question 26

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

Answer 26

Answer:A

Question 27

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

Answer 27

Answer:C

Question 28

What is a quaternary structure?

Answer 28

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

Question 29

What are simple proteins?

Answer 29

They are a function without a prosthetic group

Question 30

What is a conjugated protein?

Answer 30

Require a prosthetic group

Question 31

What does a disulfide bridge react to?

Answer 31

It is s reaction between two cysteine residues

Question 32

what is involved in a peptide bond?

Answer 32

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

Question 33

What is a zwitter ion?

Answer 33

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

Question 34

What happens during hydrolysis ?

Answer 34

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