Chapter 2: 2.2 Peptide Bond

Question 1

Proteins are ——– with —– —– being the ——–

Answer 1

1. Polymers
2. Amino acids
3. Monomers

Question 2

Define:

Polymers

Answer 2

Long chains of repeating sub-units/monomers

Question 3

In proteins:

Amino acids are joined together by what?

Answer 3

Peptide bonds

Question 4

What kind of reactions are peptide bonds?

Answer 4

Dehydration synthesis/condensation reaction

Question 5

Describe:

Peptide bond

Answer 5

• Planar
• Trans conformation between the oxygen of the carbonyl group and the hydrogen of the amide group

Question 6

Due to resonance caused by a peptide bond, there is…

Answer 6

A partial double bond between the C and N

Question 7

Due to partial double bond between the C and N, in a peptide bond what happens?

Answer 7

• No rotation between the C and N
• Free rotation around the alpha carbon

Question 8

On peptide bonds:

What is the angle around the N - Cα bond referred to as?

Answer 8

phi (φ)

Question 9

On peptide bonds:

What is the Cα - C = O bond rotation known as?

Answer 9

psi (ψ)

Question 10

On peptide bonds:

What is the peptide bond angle restrained at?

Answer 10

180° angle

Question 11

On peptide bonds:

What is the peptide bond angle? What is it known as?

Answer 11

C - N bond (omega/ω)

Question 12

On peptide bonds:

What is the side chain rotation known as?

Answer 12

chi (χ) angle

Question 13

Protein ——— structures have very specific amino acid ——– angles

Answer 13

1. Secondary
2. Backbone