Chapter 3

Question 1

Zwitterionic

Answer 1

+ and - charges

Question 2

Amphoteric

Answer 2

Functions as acid and base

Question 3

Amino group pka

Answer 3

9.4

Question 4

Carboxyl group pKa

Answer 4

2.2

Question 5

Peptides

Answer 5

Molecules containing amino acids linked together

Question 6

Oligopepetides

Answer 6

Molecules containing less than 10 amino acids

Question 7

Polypeptides

Answer 7

Molecules with 10 or more amino acids

Question 8

Proteins

Answer 8

Functional molecules consisting of 1 or more polypeptides

Question 9

Residue

Answer 9

Amino acid within peptide

Question 10

Which amino acids can absorb UV

Answer 10

W Y F

Mainly W

Question 11

If all pH is lower than pKas
Then the molecules will be _____
And the charge will be ____

Answer 11

Protonated

+1

Question 12

If the pH is above pKas
Then molecules will be ____
The charge will be ___

Answer 12

Deprotonated

-

Question 13

Isoelectric point

Answer 13

pH at one equivalent point where molecules have no net charge due to ionization

Question 14

What are essential for biomolecular interactions

Answer 14

Ion interaction

Salt bridge

Question 15

Ribozyme

Answer 15

Catalyst

Use ribosome

Question 16

Peptide bonds

Answer 16

Amide bonds link

Rigid essentially planar

Question 17

Which sterioform is factored in peptides

Answer 17

Trans

Cis steric clashes

Question 18

What are the 2 different stereoisomers and which is found in proteins

Answer 18

L (amino on left)
D (on right)

L is usually found

Question 19

How do you calculate the PI with multiple ionizable groups

Answer 19

Calculate the charge between each values of kA and use the average of the pKa above 0 and below 0