Biological Molecules: Nucleic Acids

Question 1

Which of the following is true about the differences between DNA and RNA?

A. DNA is double stranded and RNA single stranded.
B. Uracil replaces thymine in RNA.
C. The sugar in their nucleotides is different.
D. All the answers are correct.

Answer 1

D. All the answers are correct.

Question 2

What are the building blocks of DNA and RNA called?

Answer 2

nucleotides

Question 3

In a sample of double -stranded DNA, 40% of the nitrogenous bases are thymine (T). What percentage of the bases are adenine (A)?

Answer 3

40%

Question 4

Which of the following nitrogenous bases is NOT found in RNA?

A. adenine
C. cytosine
B. thymine
D. uracil

Answer 4

B. thymine

Question 5

Which of the following does NOT described the role of RNA?

A. can leave the nucleus.
B. links together amino acids
C. stores genetic information in the form of a code
D. transfer information from the mRNA to the ribosomes.

Answer 5

C. stores genetic information in the form of a code

Question 6

Which of the following statements is true regarding DNA structure?

A. DNA is single-stranded.
B. DNA forms a double helix.
C. DNA is composed of amino acids.
D. In DNA, purines pair together and pyrimidines pair together.

Answer 6

B. DNA forms a double helix.

Question 7

Which of the following statements is true?

A. Sugar component of a nucleotide is ribose
B. Sugar component of a nucleotide is deoxyribose
C. The bases in nucleotides are attached to a pentose sugar by a
glycosidic linkage
D. The sugar molecule of the nucleotide is in L-configuration

Answer 7

C. The bases in nucleotides are attached to a pentose sugar by a

Question 8

Which of the following represents a nucleotide of RNA?
I. Phosphate-Sugar-Adenine
III. Phosphate-Sugar-Thymine
II. Phosphate-Sugar-Uracil

A. I and II
C. II and III
B. III and I
D. II only

Answer 8

A. I and II

Question 9

Which of the following strands are complementary DNA sequences?

A. 5’ CCGGAT 3’ and
C. 5’ CTGTCA 3’ and
5’ ATCCCG 3’ 5’ GACAGT 3’
B. 5’ CTGTCA 3’ and
D. 5’ CUTGCG 3’ and
5’ TGACAG 3’ 5’ CGCUTG 3’

Answer 9

B. 5’ CTGTCA 3’ and

Question 10

DNA does all except ___________________.

A. serves as the genetic material passed from parent to offspring
B. remains constant despite changes in environmental conditions
C. provides the instructions for the synthesis of messenger RNA
D. is read by ribosomes during the process of translation

Answer 10

D. is read by ribosomes during the process of translation