Biological Molecules – Online MCQs Test – Biology MCAT

1. Which is NOT a characteristic of water?

Water has high heat of vaporization

Water is less dense than ice

Water exhibits strong cohesion tension

Water has a high specific heat

2. In which of the following groups are all polysaccharides?

Glycogen, cellulose and starch

Sucrose, glucose and fructose

Glycogen, sucrose and maltose

Maltose, lactose and fructose

3. A globular protein is soluble in:

Salt solutions

Solution of bases

Aqeous media

Solution of acids

4. Living surfaces are made water resistant and abrasion resistant by:

Acylglycerols

Phospholipids

Lecithin

Waxes

5. The heterogeneous group of compounds related to fatty acid is called:

Lipid

Carbohydrates

Glucose

Protein

6. Phospholipids are composed of one glycerol molecule, two fatty acids and one phosphoric acid molecule usually linked to some:

Amino group

Nitrogen group

Carboxyl group

Methyl group

7. Enzymes are composed of:

Thousands of amino acids

Tens of amino acids

Millions of amino acids

Hundreds of amino acids

8. Alpha helix and beta pleated sheets are examples of:

Quaternary proteins

Tertiary proteins

Primary proteins

Secondary proteins

9. Which one of the following amino acid have a polar uncharged R-group?

Aspartate

Glutamate

Methionine

Proline

10. An enzyme is a three dimensional ___________ protein.

Fibrous

Branched

Globular

Straight

11. Which one of the following is also known as fungal cellulose?

Chitin

Starch

Glycogen

Cellulose

12. All of the following are correct about water EXCEPT

There is little attraction between water molecules

The covalent bonds between oxygen and hydrogen are polar or unbalanced

Water is molecule

The reason that water and lipids do not mix is because water is a polar molecule while lipids are non-polar

13. During strenuous exercise glucose is converted into

Lactic acid

Starch

Glycogen

Pyruvic acid

14. Pick up the correct statement:

Enzymes increase the activation energy

All enzymes require a cofactor for their proper functioning

Large amount of an enzyme can accelerate chemical reactions

Enzymes are sensitive to even minor changes in pH, temperature and substrate conc.

15. Which of the following is not a polynucleotide?

t-RNA

m-RNA

NAD

r-RNA

16. Which of the following is not a polysaccharide?

Cellulose

Chitin

Glycerol

Glycogen

17. The term zymogen is used for:

Active enzymes

Digestive enzymes

Inactive enzymes

Trypsinogen

18. Which of the following is a trace element required only in small amounts by most living things?

Nitrogen

Oxygen

Hydrogen

Iron

19. The most abundant compound in living cells is

Carbon

Oxygen

Water

Hydrogen

20. _____________ are involved in the storage of amino acids:

Antibody and casein

Keratin and fibrinogen

Ovalbumin and casein

Ovalbumin and fibrinogen

Biological Molecules-Medical College Admission Test Preparation Notes