Amino Acids

Question 1

What is the conformation of the 20 amino acids and why?

Answer 1

The conformation is a-amino acids
Because
- the amide group and carbon group are attached to the same a-carbon

Question 2

Draw out the 20 amino acids

Question 3

List down non-polar, polar, positive and negative charged amino acids.

Answer 3

N-Polar - Govind And Valine Live In Mansion With Purple Flag
Polar-Naughty Twin Sisters Quizzed Young Chris Harry
Positive (base)- arg and lysine
Negative (acidic)- Glu and asp

Question 4

What are the two types of stereoisomers?

Answer 4

Stereoisomers are non mirror images of a compound. Same composition but different spatial arrangements.

Diastereoisomers and enantiomers.

Diastereisomers occur when only some chirality changes eg- Cis and trans , SSS -> SRS
Enantiomers occurs when all chirality changes eg- D and L , SSS-> RRR

Question 5

Amino acids occur in D or L configuration?

Answer 5

L and chiral

Question 6

How many amino acids are achiral, chiral , have more then 1 chiral centre

Answer 6

A chiral - 1 - glycine
More then one chiral centre - 2 - thr and ile
Chiral - 17 - the rest

Question 7

DRAWING STRUCTURES

Question 8

1- draw the D and L configuration of glyceraldehyde and serine and glycine

Answer 8

Note- glycine is glycine, no D and L , bcz not chiral
Or just L bcz all naturally occurring AA are in L configuration

Question 9

2-Draw the cis and trans of maleic and fumaric acid

Question 10

Draw the two configuration of thalidomide