Question 1

Which of the following nitrogenous bases is classified as a purine?

Accepted Answer

Adenine

Answer

Uracil

Answer

Thymine

Answer

Cytosine

Question 2

Which of the following statements about RNA is true?

Accepted Answer

RNA is usually single-stranded

Answer

RNA is made of deoxyribonucleotides

Answer

RNA contains thymine as a base

Answer

RNA is found only in the nucleus

Question 3

Which pair of nitrogenous bases in DNA are classified as purines?

Accepted Answer

Adenine and Guanine

Answer

Adenine and Thymine

Answer

Thymine and Uracil

Answer

Cytosine and Thymine

Question 4

Which of the following is a pyrimidine base found in RNA?

Accepted Answer

Uracil

Answer

Cytosine

Answer

Guanine

Answer

Adenine

Question 5

Which nucleotide is a component of both DNA and RNA?

Accepted Answer

Cytosine

Answer

Uracil

Answer

Thymine

Answer

Deoxyribose

Question 6

What type of bond connects the nitrogenous bases in the double helix structure of DNA?

Accepted Answer

Hydrogen bonds

Answer

Ionic bonds

Answer

Peptide bonds

Answer

Covalent bonds

Question 7

Which of the following best describes the structure of DNA?

Accepted Answer

Double helix

Answer

Single strand

Answer

Linear chain

Answer

Triple helix

Question 8

Which component of a nucleotide distinguishes RNA from DNA?

Accepted Answer

Ribose sugar

Answer

Uracil base

Answer

Thymine base

Answer

Double-stranded structure

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