Amino Acids & Peptides

Question 1

NON-POLAR (Neutral) Amino acids

Answer 1

Hydrophobic w/ hydrocarbon (Alkyl or Aromatic) side chains

Question 2

POLAR (Neutral) Amino acids

Answer 2

Hydrophilic w/ polar or ionic side chains

Question 3

POLAR Acidic Amino acids

Answer 3

Hydrophilic w/ acidic side chains (-COOH)

Question 4

POLAR Basic Amino acids

Answer 4

Hydrophilic w/ -NH2 side chains

Question 5

Dipeptide

Answer 5

A MOLECULE containing TWO amino acids joined by a peptide bond

Question 6

Tripeptide

Answer 6

A MOLECULE containing THREE amino acids joined by a peptide bond

Question 7

Polypeptide

Answer 7

A MACROMOLECULE containing MANY amino acids joined by a peptide bond

Question 8

Protein

Answer 8

A BIOLOGICAL MACROMOLECULE containing AT LEAST 40 amino acids joined by a peptide bond

Question 9

C-terminal Amino acid

Answer 9

Amino acid at the end of the chain have free –COO- group (always written at the right)

Question 10

N-terminal Amino acid

Answer 10

Amino acid at the end of the chain having free —NH3+ group (always written at the left)

Question 11

pH Level 6-7

Answer 11

Zwitterion (Neutral)
Positive (+) = Negative (-)

Question 12

pH Level 3 or Less

Answer 12

—COO- acts as a BASE & ACCEPTS H+

Question 13

pH Level 10 or Higher

Answer 13

—NH3+ acts as an ACID & LOSES H+