2 - Proteins

Question 1

are polymers of amino acids

Answer 1

Proteins

Question 1

What are the structures of amino acids

Answer 1

B-pleated sheet
a-helix

Question 2

what does amino acids contains in ff. chemical groups attached to an alpha carbon a-carbon

Answer 2

Amino group
Carboxyl group
Side chain group (R)

Question 3

Gives the identity to amino acid

Answer 3

Side chain group (R)

Question 4

What amino acid that does not have at least one stereocenter and is achiral

Answer 4

Glycine

Question 5

have at least one stereocenter (a-C) and are chiral (stereoisomers)

Answer 5

Amino acids

Question 6

What are the two stereoisomers of amino acid

Answer 6

L- and D-amino acid
Majority of amino acids are in L- configuration

Question 7

molecules that contain both positive and
negative charges

Answer 7

ZWITTERION

Question 8

proton donor

Answer 8

Bronsted Acid

Question 9

proton acceptor

Answer 9

Bronsted Base

Question 10

yields the different ionization states of amino acids

Answer 10

TITRATION OF AMINO ACIDS

Question 11

the pH at which the net charge of an amino acid/peptide is zero

Answer 11

Isoelectric pH (pI)

Question 12

formula for Isoelectric pH (pI)

Answer 12

pI = pKa1 + pKa2/2

Question 13

amide bond between the alpha -carboxyl group of one amino acid and the alpha - amino group of another amino acid

Answer 13

PEPTIDE BOND

Question 14

What are the characteristics of the Peptide bond

Answer 14

Partial double bond character
Planar

Question 15

In a peptide bond what bonds are possible to rotate, which allows the formation secondary structure

Answer 15

N-C and C-C bonds

Question 16

How is two or more amino acids linked together?

Answer 16

Peptide bonds

Question 17

(free amino group)

Answer 17

N-terminus

Question 18

Free carboxyl group

Answer 18

C-terminus