Nucleic acids - DNA and RNA — NEET & JEE Questions

Question 1 · difficulty L1 · recall

The sugar present in DNA is

• A. deoxyribose
• B. ribose
• C. glucose
• D. fructose

Question 2 · difficulty L2 · understanding

Match List-I with List-II List - I List - II A Adenosine I Nitrogen base B Adenylic acid II Nucleotide C Adenine III Nucleoside D Alanine IV Amino acid Choose the option with all correct matches.

• A. A-III, B-II, C-I, D-IV
• B. A-II, B-III, C-I, D-IV
• C. A-III, B-IV, C-II, D-I
• D. A-III, B-II, C-IV, D-I

Question 3 · difficulty L2 · understanding

A nucleotide consists of

• A. a nitrogenous base, a pentose sugar and a phosphate group
• B. a fatty acid, glycerol and phosphate only
• C. two amino acids
• D. a sugar and amino acid only

Question 4 · difficulty L2 · understanding

Which base is normally found in RNA in place of thymine?

• A. Uracil
• B. Cytosine
• C. Guanine
• D. Adenine

Question 5 · difficulty L3 · understanding

Which of the following is a nucleotide?

• A. Uridine
• B. Adenylic acid
• C. Guanine
• D. Guanosine

Question 6 · difficulty L3 · understanding

Match List-I with List-II List-I List-II (a) Adenine (i) Pigment (b) Anthocyanin (ii) Polysaccharide (c) Chitin (iii) Alkaloid (d) Codeine (iv) Purine Choose the correct answer from the options given below

• A. (a) - (i), (b) - (iv), (c) - (iii), (d) - (ii)
• B. (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
• C. (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
• D. (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)

Question 7 · difficulty L3 · understanding

If DNA contained sulfur instead of phosphorus and proteins contained phosphorus instead of sulfur, what would have been the outcome of Hershey and Chase experiment?

• A. Radioactive phosphorus in bacterial cells
• B. No radioactive sulfur in bacterial cells
• C. Both radioactive sulfur and phosphorus in bacterial cells
• D. Radioactive sulfur in bacterial cells

Question 8 · difficulty L3 · understanding

Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

• A. Allele ‘i’ does not produce any sugar.
• B. The gene (I) has three alleles.
• C. When I A and I B are present together, they express same type of sugar.
• D. A person will have only two of the three alleles.

Question 9 · difficulty L4 · application

If one DNA strand contains the sequence 5'-ATGC-3', the complementary antiparallel strand is

• A. 3'-TACG-5'
• B. 5'-TACG-3'
• C. 3'-AUGC-5'
• D. 3'-ATGC-5'

Question 10 · difficulty L4 · application

A nucleic-acid sample contains ribose and uracil. It is most likely

• A. RNA
• B. DNA
• C. a triglyceride
• D. a protein