Amino Acids

Question 1

The groups of amino acids?

Answer 1

• Amine group
• R group
• Carboxylic group

Question 2

Types of amino acids

Answer 2

• glycine
• aspartic acid
• alanine
• serine
• valine

Question 3

What is the secondary structure?

Answer 3

- The alpha helix:
Twisted shape like a spring
Hydrogen bonds between C=O and NH groups for stability.
- Beta fold:
Pleated sheets
Hydrogen bonds in parallel chains

Question 4

What is the tertiary structure:

Answer 4

• Polypeptide chains bend to produce 3 dimensional shapes.

- chemical bonds and hydrophobic reactions between the R groups.

Question 5

The 4 bonds involved in tertiary structure?

Answer 5

1) hydrogen bonds (the weakest)
2) ionic bonds between the R groups
3) sulphur bridges (the strongest)
4) hydrophobic interactions between R groups

Question 6

What is the Quaternary structure?

Answer 6

• A protein made up of several polypeptide chains held together
• Held together by the same bonds as tertiary
• Form biological active molecules