Proteins Flashcards Preview

Biology A Level > Proteins > Flashcards

Flashcards in Proteins Deck (14):
1

Protein function

Structural component (muscle)
Enzymes
Antibodies
Hormones
In membranes (carries)

2

Disulfide links

R groups of cysteine contains sulfur
Strong covalent bonds between 2 sulfur

3

Hydrophobic /hydrophilic interactions

Hydrophobic parts of R group associate in centre of chain to avoid water
Hydrophilic on outside causes twisting of chain so changes shape—important because most proteins in water

4

Amino acids contain...(elements)

Carbon
Hydrogen
Oxygen
Nitrogen

5

Amino group

-NH₂

6

Primary structure
Secondary structure
Tertiary structure
Quaternary structure

Sequence of amino acids

Coiling/folding of amino acid chain (H bonds)

3D shape

More than 1 polypeptide chain

7

In an α-helix, hydrogen bonds are between…

-NH group and -CO group
3 places in between

8

β-pleated sheet

Chain folds over itself
Bond between -NH and
-CO

9

Fibrous protein examples

Keratin
Elastin
Collagen

10

Keratin is strong/hard because…

Disulfide bridges

11

Elastin in vessels to…

Maintain blood pressure
Stretch and recoil

12

Collagen in vessel walls to…

Prevent arteries bursting and withstand pressure

13

Globular proteins have a _________ role and a ________ ____

Metabolic
Specific shape

14

Globular protein examples

Pepsin
Insulin
Haemoglobin