Stereochemistry in Biomolecules Flashcards
1
Q
Stereochemistry properties of amino acids
A
- all amino acids are chiral
- have 2 different enantiomers
- 4 different substituents groups
- optical isomers
- L form is the naturally occuring
2
Q
Why is cellulose important in the diet
A
dietary fibre
3
Q
naturally occuring form of amino acids
A
L-form
4
Q
when does partial hydrogenation occur
A
some of the C=C bonds are broken and those that remain get modified from the cis position to the trans position
5
Q
sugars occur naturally as (L or D)
A
D isomers
6
Q
How do D and L sugar isomers differ
A
- the chiral carbon furthest from the ketone or aldehyde group
- if the OH group is on the left it is L isomer
- if the OH group is on the right it is a D isomer
7
Q
what is the difference between alpha and beta glucose
A
- alpha the OH is below
- beta the OH is above
8
Q
How are the bonds in cellulose
A
The hydroxyl groups in the cellulose molecules form hydrogen bonds with the hydroxyl groups of other cellulose molecules lying parallel to each other.
9
Q
What does cellulose form
A
microfibrils
10
Q
A
When rhodopsin is exposed to light, cis-retinal is converted to trans-retinal
- cis-retinal & opsin can make rhodopsin
