Proteins

The diagrams show four fatty acids, each with a chain of 18 carbon atoms.

Which fatty acid, as part of a phospholipid molecule, would contribute most to the fluidity of a cell surface membrane?

• A

• B

• C

• D

Which levels of protein structure are maintained by disulfide bonds?

• A secondary, tertiary and quaternary

• B tertiary and quaternary only

• C quaternary only

• D tertiary only

A person with diabetes is unable to make enough of the protein insulin.

Some forms of diabetes can be treated by using insulin produced by animals. Scientists have compared the amino acids in insulin produced by animals to human insulin.

Which level of protein structure were the scientists studying?

• A primary

• B secondary

• C tertiary

• D quaternary

Which molecules are globular proteins?

1 amylase

2 haemoglobin

3 DNA polymerase

• A 1, 2 and 3

• B 1 and 2 only

• C 1 and 3 only

• D 2 only

In unsaturated lipid molecules, where are double bonds located?

• A between fatty acids and glycerol

• B within fatty acids and within glycerol

• C within fatty acids only

• D within glycerol only

Phospholipids and triglycerides are important biological molecules. Which properties are correct for these molecules?

• A

• B

• C

• D

Which molecules contain C=O bonds?

1 amino acids 2 fatty acids 3 glycerol

• A 1, 2 and 3

• B 1 and 2 only

• C 1 and 3 only

• D 2 and 3 only

Tags

NGSS.HS-PS1-2

Which row describes a collagen molecule?

• A

• B

• C

• D

Which statements about a peptide bond are correct?

1 It joins two monomers which are always identical to each other.

2 It contains four different atoms.

3 It can be broken by the addition of water at room temperature.

4 It is important in the primary structure of proteins.

• A 1, 2 and 3

• B 1 and 3 only

• C 2, 3 and 4

• D 2 and 4 only

Tags

NGSS.HS-LS1-1

Which statements about the primary structure of a protein are correct?

1 It may be branched.

2 It is determined by the sequence of DNA bases.

3 It is unique to that protein.

4 It determines the tertiary structure of the protein.

• A 1, 2 and 3

• B 1, 2 and 4

• C 1, 3 and 4

• D 2, 3 and 4

Tags

NGSS.HS-LS1-1