Biological Molecules – Online MCQs Test – Biology MCAT

1. The body of ribosomes is formed by:

Messenger RNA

snRNA

Transfer RNA

Ribosomal RNA

2. An enzyme is mostly a:

Quaternary protein

Secondary protein

Tertiary protein

Primary protein

3. Which of the following is not a carbohydrate?

Glucose

Lactose

Insulin

Starch

4. The raw material for a coenzyme NAD is a vitamin called:

Riboflavin

Vitamin B₁₂

Vitamin D

Niacin

5. Which one of the following pairs is not correctly matched?

Recombinant DNA − DNA formed by the joining of segments of DNA from different sources

Purine − nitrogenous bases cytosine thymine and uracil

ATP − the principal energy carrying compound in the cell

RNA − molecules found in ribosomes

6. More than ________ types of proteins have been discovered from human body, which are made up of _____________ types of amino acids:

10000, 20

1000, 25

10000, 25

1000, 20

7. These are frequently associated with cellular membranes:

Acylglycerols

Waxes

Terpenoids

Phospholipids

8. Glycosidic link is broken in digestion of

Protein

All of these

Starch

Lipid

9. Which one of the following bonds of organic biomolecules does not involve oxygen bridge?

Ester bond

Peptide bond

Phosphodiester bond

Glycosidic bond

10. The similarity between DNA and RNA is that both are

Polymers of nucleotides

Double stranded

Having similar sugars

Having similar pyrimidines

11. At saturation point:

Further increase in temperature will increase the rate of enzyme catalysis

Further increase in pH will increase the rate of enzyme catalysis

Further increase in enzyme conc. will have no effect on the rate of enzyme catalysis

Further increase in substrate conc. will have no effect on the rate of enzyme catalysis

12. Pick up the terpenoid:

Lignin

Chitin

Xanthophyll

Cutin

13. A polysaccharide found In plants whose function is storage is

chitin

Glucagon

Starch

Glycogen

14. Which of the following is not a polynucleotide?

t-RNA

m-RNA

r-RNA

NAD

15. Among the energy values or nutrients, 9.1 calories is that of

Carbohydrates

Vitamins

Fats

Proteins

16. Cn(H₂O)n is a general formula of:

Monosaccharides

Carbohydrates

Polysaccharides

Oligosaccharides

17. The inhibitor that destroys the enzyme’s active site permanently are called:

Reversible inhibitors

Irreversible inhibitors

Competitive inhibitors

Non-competitive inhibitors

18. Human blood contains:

100 mg of glucose per 1000 ml of blood

10 mg of glucose per 100 ml of blood

100 mg of glucose per 100 ml of blood

10 mg of glucose per 10 ml of blood

19. strands of DNA are bonded by

Carbon

Oxygen

Hydrogen

Nitrogen

20. Activation energy is denoted by:

AcE

E.Ac

Biological Molecules-Medical College Admission Test Preparation Notes