Biology Unit 2 Module 1 Part B

Front 1

What are amino acids made from?

Back 1

Amino group
carboxylic acids

Front 2

How many amino acids are there?

Back 2

20

Front 3

How are amino acids joined?

Back 3

Condensation reactions which produces a polypeptide

Front 4

The bond produced in the condensation reactions for joining amino acids?

Back 4

peptide bonds

Front 5

What is the primary structure of a polypeptide?

Back 5

The order of amino acids in a polypeptide

Front 6

What is the secondary structure of a polypeptide?

Back 6

Alpha helix and beta pleated sheet held together only by hydrogen bonds.

Front 7

What is the tertiary structure of a polypeptide?

Back 7

Final 3d structure, further coiling and folding. Contains hydrogen bonds, ionic bonds, disulfide bonds, hydrophobic and hydrophilic bonds.

Front 8

What is a quaternary structure of a protein?

Back 8

2 or more polypeptide chains interacting together to produce the final protein

Front 9

Features of a globular protein

Back 9

rolled up into a ball
usually soluble
have metabolic roles
example- haemoglobin

Front 10

Features of a fibrous protein

Back 10

form fibres
insoluble
structural
examples- collagen

Front 11

Collagen

Back 11

3 polypeptides make up collegen
each chain is coiled
chains are then coiled around each other
35% glycine
fibrous protein
provides mechanical strength

Front 12

Uses of collagen

Back 12

prevents high pressure bursting arteries
connects skeletal muscles to bones
formed from collagen, reinforced with calcium

Front 13

Haemoglobin

Back 13

soluble globular protein
transports oxygen in the blood
4 polypeptide binded (2 alpha, 2 beta)
each polypeptide has a haem group containing iron.

Front 14

Test of sugar

Back 14

Benedict's test
Brick red percipitate of sugar is present.
if no remains blue

Front 15

Test for starch

Back 15

Iodine test
Solution will turn blue/black if starch is present
if not will remain a honey colour

Front 16

Test of protein

Back 16

Biuret test
Solution will turn lilac if present
Stay blue if not

Front 17

Test of lipids

Back 17

If present a cloudy white emulsion will appear