This quiz has a mixture of SL and HL questions
1. The general formula for an amino acid is NH2CHRCOOH.
Which groups are used in forming the peptide bond?
  • A. R group and amine group
  • B. R group and carboxyl group
  • C. Amine group and carboxyl group
  • D. Amine group and Hydrogen

2. All the proteins produced by a cell, tissue or an organism is called a...

  • A. genome
  • B. ribosome
  • C. nucleus
  • D. proteome
3. The protein, haemoglobin, consists of ...
  • A. one polypeptide
  • B. three polypeptides
  • C. three amino acids
  • D. four polypeptides

4. Insulin consists of 2 polypeptide chains, the A chain made up of 21 amino acids and the B chain made of 30 amino acids. The two chains are linked by 2 disulphide bridges between cysteine residues.
How many peptide bonds are in two molecules of insulin?

  • A. 51
  • B. 49
  • C. 98
  • D. 102

5. Which of the following is true about dietary requirements for amino acids?

  • A. Essential amino acids can be synthesized by the body and do not need to be obtained from food.
  • B. Non-essential amino acids cannot be synthesized by the body and must be obtained from food
  • C. Vegan diets require attention to ensure non-essential amino acids are consumed.
  • D. Essential amino acids cannot be synthesized by the body and must be obtained from food.
AHL questions:

The image is for Q6 and 7. This image shows myoglobin, a single-chain polypeptide present in muscles.

ChimeraX_rendering_of_myoglobin
0fb1d8 - CC-BY-SA 4.0

6. What level(s) of structure can be seen?

  • A. Alpha helix only
  • B. Primary and secondary
  • C. Secondary and tertiary
  • D. Quaternary

 7. Which statement best describes the structure of myoglobin?

  • A. Conjugated protein with a non-protein prosthetic group
  • B. Non-conjugated protein
  • C. Conjugated quaternary protein with non-protein prosthetic group
  • D. Modified protein since it has undergone post-translational modifications

8. The image shows a molecule of glutamic acid.

What is shown by the section labelled X?

Glutamic Acid
  • A. Variable R group 
  • B. Carboxyl group 
  • C. Amine group
  • D. Peptide bond

9+10: These questions refer to this diagram of a cell membrane:

cell membrane diagram

9. Which structure is a conjugated protein?

  • A. F
  • B. G
  • C. H
  • D. L

10. In structure F, which statement accurately describes the role of polar amino acids?

  • A. Polar amino acids are essential for anchoring F within the phospholipid bilayer.
  • B. Polar amino acids allow F to form hydrogen bonds with water molecules, facilitating the passage of ions or polar molecules through the channel.
  • C. Polar amino acids determine the secondary structure of this protein.
  • D. Polar amino acids regulate the opening and closing of F in response to ligand binding.