Biological Molecules – Online MCQs Test – Biology MCAT

1. Starch and cellulose are the compounds consist of many units of

Amino acids

Glycerol

Simple sugars

Fatty acids

2. The word carbohydrate literally means:

Reduced carbons

Hydrolyzed carbons

Dehydrated carbons

Hydrated carbons

3. Where are hydrogen bonds important for life?

Between hydrogen atoms

Between water molecules

In ionic substance

AII of the above

4. Pick up the terpenoid:

Xanthophyll

Lignin

Chitin

Cutin

5. Activation energy is measured in:

Kcal/Mol

KJ/Mol or Kacl/Mol

Cal/Mol

KJ/Mol

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

Glycogen

Cellulose

Chitin

Starch

7. A ribose (but not deoxyribose) nucleotide is

Guanine − pantose sugar − phosphate

Thymine −pentose sugar − phosphate

Cytosine − pentose sugar – phosphate

Uracil − pentose sugar − phosphate

8. Which is NOT a characteristic of water?

Water is less dense than ice

Water exhibits strong cohesion tension

Water has a high specific heat

Water has high heat of vaporization

9. All of the following are correct about water EXCEPT

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

Water is molecule

There is little attraction between water molecules

The covalent bonds between oxygen and hydrogen are polar or unbalanced

10. Animal fats have:

One or more double bonds

Saturated fatty acids

Unsaturated fatty acids

Low melting points

11. In a phospholipid molecule phosphoric acid is attached to the carbon number _________ of glycerol:

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

Protein

Lipid

Carbohydrates

Glucose

13. Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

Base – sugar − OH

Base – sugar – phosphaten

Base – sugar – phosphate

Sugar – phosphate

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

ATP − the principal energy carrying compound in the cell

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

Purine − nitrogenous bases cytosine thymine and uracil

RNA − molecules found in ribosomes

15. Three nucleotide sequence on tRNA that specifies an amino acid is:

Nonsense codon

Codon

Genetic code

Anticodon

16. These electrophilic groups make covalent bonds with amino acid side chains:

Non-competitive inhibitors

The irreversible inhibitors

Competitive inhibitor

The reversible inhibitors

17. An enzyme is mostly a:

Secondary protein

Primary protein

Quaternary protein

Tertiary protein

18. The body of ribosomes is formed by:

Transfer RNA

snRNA

Ribosomal RNA

Messenger RNA

19. Activation energy is denoted by:

E.Ac

AcE

20. Sixty _______ have been identified:

rRNA

mRNA

tRNA

snRNA

Biological Molecules-Medical College Admission Test Preparation Notes