Importance of Proteins

Importance of Proteins MDCAT MCQs with answers

11 past paper MCQs on Importance of Proteins, from the Macromolecules unit of MDCAT Chemistry. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.

Read the notes first Practise the unit as a quiz

1.Which of the following proteins acts as a carrier of copper in blood plasma? (MDCAT 2022)

  1. haemoglobin
  2. glycoprotein
  3. ceruloplasmin
  4. histone
Show answer

Correct answer: (c) ceruloplasmin

Ceruloplasmin carries most of the copper of the plasma.

2.After digestion and before absorption, the products of proteins are: (MDCAT 2023)

  1. amino acids and small polypeptides
  2. only amino acids
  3. only small polypeptides
  4. polysaccharides
Show answer

Correct answer: (a) amino acids and small polypeptides

Proteases cut proteins down to amino acids and short peptides, and both are taken up by the intestinal wall.

3.Protein present in connective tissues of human body is: (NUMS MDCAT 2025)

  1. Phosphoprotein
  2. Collagen
  3. Lecithin
  4. Cholesterol
Show answer

Correct answer: (b) Collagen

Collagen is the fibrous protein of tendon, ligament, skin and bone.

4.In human body Ferritin is used to store: (NUMS MDCAT 2025)

  1. P
  2. Ca
  3. Fe
  4. Zn
Show answer

Correct answer: (c) Fe

Ferritin is the iron store of the liver and the spleen.

5.In human body Ceruloplasmin acts as a carrier of: (NUMS MDCAT 2025)

  1. O2
  2. Zn
  3. Cu
  4. Fe
Show answer

Correct answer: (c) Cu

Ceruloplasmin is the copper carrying protein of the blood plasma.

6.Casein is used in manufacturing of _________. (PMC Practice 2021)

  1. Buttons & buckles
  2. Tanning of leather
  3. Gelatin
  4. Bakery goods
Show answer

Correct answer: (a) Buttons & buckles

Casein from milk is moulded into buttons and buckles.

7._____ is a macromolecule found in blood. (PMC Practice 2021)

  1. Hemoglobin
  2. Plasma
  3. Creatinine
  4. Plasmids
Show answer

Correct answer: (a) Hemoglobin

Haemoglobin is the large conjugated protein of the red cells.

8.Based on function, thyroxine can be classified as: (PMC MDCAT 2020)

  1. Hormonal protein
  2. Structural protein
  3. Transport protein
  4. Genetic protein
Show answer

Correct answer: (a) Hormonal protein

Thyroxine carries a message from a gland to its target, so it is classed as a hormonal protein.

9.According to Watson and Crick’s model of DNA, the DNA molecule consists of a double helix. What type of forces are responsible to keep two strands of DNA together? (UHS MDCAT 2019)

  1. Van der Waals forces
  2. Ionic bonding
  3. Hydrogen bonding
  4. Dipole-induced dipole forces
Show answer

Correct answer: (c) Hydrogen bonding

The bases of the two strands are paired by hydrogen bonds.

10.An intermolecular force of attraction X is relatively stronger than the other intermolecular forces. It stabilizes alpha-helix and Beta-pleated sheets of proteins. The double helical structure of DNA is also stabilized by this force of attraction. Identify X. (UHS MDCAT 2019)

  1. Van Der Waals Forces
  2. Hydrogen bonding
  3. Ionic interactions
  4. Dipole dipole attraction
Show answer

Correct answer: (b) Hydrogen bonding

Hydrogen bonds hold the alpha helix, the pleated sheet and the two strands of DNA alike.

11.Haemoglobin is a (UHS MDCAT 2015)

  1. Genetic protein
  2. Building protein
  3. Transport protein
  4. Structural protein www.PakLearningSpot.com
Show answer

Correct answer: (c) Transport protein

Haemoglobin carries oxygen, so it is a transport protein.

More in Macromolecules