Proteins multiple choice questions – A-Level Biology (OCR)

Proteins

Total marks:0 / 13

1 of 13

Which level of organisation of a haemoglobin molecule is coded by a DNA molecule?

0 / 1

2 of 13

The diagrams show the structures of two amino acids, each of which has two amine (–NH₂) groups.

Diagrams showing the structures of two amino acids each with two amine groups and the formation of a peptide bond.

A peptide bond is formed between the two amino acids.

Which groups form the peptide bond?

0 / 1

3 of 13

Which statements about a peptide bond are correct?

1 - it joins two monomers that 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

0 / 1

4 of 13

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

0 / 1

5 of 13

What could describe the tertiary structure of a protein?

1 - α-helix

2 - a globular structure

3 - the specific order of amino acids

4 - a specific three-dimensional (3D) shape

0 / 1

6 of 13

A conjugated protein is held together by many different types of bond.

Which bond is not formed when a conjugated protein folds into its quaternary structure?

0 / 1

7 of 13

Which feature of haemoglobin makes it a globular protein?

0 / 1

8 of 13

Which is the strongest type of bonding found in proteins?

0 / 1

9 of 13

Which description is correct?

0 / 1

10 of 13

Collagen is found in tendons. Tendons attach muscles to bones.

Which properties make collagen suitable for this role?

0 / 1

11 of 13

Haemoglobin consists of two α chains and two β chains. Approximately 5% of all humans have one amino acid in the β chain that has been changed, affecting the structure and stability of haemoglobin.

Which of the levels of protein structure could be changed in the haemoglobin of these humans?

0 / 1

12 of 13

Lysozyme is an enzyme found in tears and saliva.

Which statement refers only to the tertiary structure of lysozyme?

0 / 1

13 of 13

The diagram below is a chromatogram of three different amino acids. The distance travelled by the solvent from the baseline is 50 mm.

Chromatogram showing the distance travelled by three amino acids leucine, phenylalanine, and lysine from the baseline.

Using the information in the chromatogram, which option is the Rf value for the amino acid leucine (Leu)?

0 / 1

Proteins

Total marks:0 / 13

1 of 13

Which level of organisation of a haemoglobin molecule is coded by a DNA molecule?

0 / 1

2 of 13

The diagrams show the structures of two amino acids, each of which has two amine (–NH₂) groups.

A peptide bond is formed between the two amino acids.

Which groups form the peptide bond?

0 / 1

3 of 13

Which statements about a peptide bond are correct?

1 - it joins two monomers that 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

0 / 1

4 of 13

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

0 / 1

5 of 13

What could describe the tertiary structure of a protein?

1 - α-helix

2 - a globular structure

3 - the specific order of amino acids

4 - a specific three-dimensional (3D) shape

0 / 1

6 of 13

A conjugated protein is held together by many different types of bond.

Which bond is not formed when a conjugated protein folds into its quaternary structure?

0 / 1

7 of 13

Which feature of haemoglobin makes it a globular protein?

0 / 1

8 of 13

Which is the strongest type of bonding found in proteins?

0 / 1

9 of 13

Which description is correct?

0 / 1

10 of 13

Collagen is found in tendons. Tendons attach muscles to bones.

Which properties make collagen suitable for this role?

0 / 1

11 of 13

Which of the levels of protein structure could be changed in the haemoglobin of these humans?

0 / 1

12 of 13

Lysozyme is an enzyme found in tears and saliva.

Which statement refers only to the tertiary structure of lysozyme?

0 / 1

13 of 13

The diagram below is a chromatogram of three different amino acids. The distance travelled by the solvent from the baseline is 50 mm.

Using the information in the chromatogram, which option is the Rf value for the amino acid leucine (Leu)?

0 / 1

Proteins - exam practice

Proteins

Question 1 of 13

Question 2 of 13

Question 3 of 13

Question 4 of 13

Question 5 of 13

Question 6 of 13

Question 7 of 13

Question 8 of 13

Question 9 of 13

Question 10 of 13

Question 11 of 13

Question 12 of 13

Question 13 of 13

Proteins - exam practice

Proteins

Question 1 of 13

Question 2 of 13

Question 3 of 13

Question 4 of 13

Question 5 of 13

Question 6 of 13

Question 7 of 13

Question 8 of 13

Question 9 of 13

Question 10 of 13

Question 11 of 13

Question 12 of 13

Question 13 of 13