Lipid/Protein Revision Carousel

Question 1

What is the Tertiary Structure of a Protein?

Answer 1

Folding into a 3D shape

Question 2

What is the difference in structure between saturated and unsaturated lipids?

Answer 2

-Saturated: all single C-C bonds in fatty acid chain
-Unsaturated: 1 or more double C=C bonds in fatty acid chain

Question 3

What is the Primary Structure of a protein?

Answer 3

Amino Acid Sequence

Question 4

Name the bond formed between two amino acids.

Answer 4

Peptide

Question 5

What is the secondary structure of a protein?

Answer 5

alpha-helix + bets -pleated sheets

Question 6

What is another term for the condensation reaction that makes lipids?

Answer 6

Esterification

Question 7

State the bond involved in the tertiary structure of a protein.

Answer 7

Ionic, Covalent, Hydrogen, Hydrophobic and Hydrophilic Interactions, Disulphide Bridges

Question 8

Describe a positive result for proteins.

Answer 8

Using Biuret Solution: Blue to Purple

Question 9

Why do oils contain unsaturated triglycerides rather than saturated?

Answer 9

-Unsaturated fatty acids cause the molecule to kink/bend
-Cannot pack closely together

Question 10

What is the quaternary structure?

Answer 10

Binding with other subunits

Question 11

Describe the steps in identifying lipids and state the positive result.

Answer 11

-Mix sample with ethanol
-Mix solution with water and shake
-White emulsion layer formed lipid present

Question 12

Describe the phospholipid bilayer arrangement.

Answer 12

-Hydrophilic heads point outwards
-Hydrophobic tails point inwards (shielded from aqueous environment)

Question 13

State the bond involved in the secondary structure of a protein.

Answer 13

Hydrogen bond

Question 14

What are the components that make up an amino acid?

Answer 14

Central carbon + H atom + Amine group + Carboxyl group