Question 1

Which type of chemical bond links nucleotides together in a single strand of DNA?

Accepted Answer

Phosphodiester bond

Question 2

According to Chargaff’s rules, if a double-stranded DNA molecule contains 30% adenine (A), what percentage of guanine (G) does it contain?

Accepted Answer

$$20\%$$

Question 3

Which of the following best describes the antiparallel nature of DNA?

Accepted Answer

One strand runs 5' to 3', and the other runs 3' to 5'.

Question 4

Which nitrogenous base pairs with cytosine in a DNA molecule?

Accepted Answer

Guanine

Question 5

During DNA replication, in which direction are new DNA strands synthesized?

Accepted Answer

5' to 3'

Question 6

Which of the following is a difference between DNA and RNA?

Accepted Answer

RNA contains ribose sugar, while DNA contains deoxyribose.

Question 7

A DNA sample contains 40% G + C. What percentage is A + T?

Accepted Answer

$$60\%$$

Question 8

Which of the following best describes a nucleotide?

Accepted Answer

A nitrogenous base, a sugar, and a phosphate group

Question 9

If one strand of DNA has the sequence 5’-ACGTT-3’, what is the sequence of the complementary strand?

Accepted Answer

3’-TGCAA-5’

Question 10

Which of the following is NOT a function of DNA sequence information?

Accepted Answer

Synthesizing amino acids directly

Question 11

Which of the following is a purine found in DNA?

Accepted Answer

Adenine

Question 12

Which chemical group is attached to the 5’ carbon of the deoxyribose sugar in a nucleotide?

Accepted Answer

Phosphate group

Question 13

Which of the following best explains why G-C base pairs provide more stability to the DNA double helix than A-T base pairs?

Accepted Answer

G-C pairs form three hydrogen bonds, while A-T pairs form two.

Question 14

Which of the following is a direct evidence that DNA is the genetic material?

Accepted Answer

Transformation experiments showing that DNA can transfer genetic traits.

Question 15

Which of the following is a function of messenger RNA (mRNA)?

Accepted Answer

Serves as a template for protein synthesis

Question 16

Which of the following best describes the difference between a nucleoside and a nucleotide?

Accepted Answer

A nucleotide contains a phosphate group, while a nucleoside does not.

Question 17

Which of the following is a real-world application of recombinant DNA technology?

Accepted Answer

Synthesis of human insulin in bacteria

Question 18

Which of the following best describes the role of phosphodiester bonds in DNA?

Accepted Answer

They link nucleotides together in a single strand.

Question 19

Which of the following is a pyrimidine found in DNA?

Accepted Answer

Cytosine

Question 20

A mutation changes a guanine (G) to an adenine (A) in a DNA sequence. Which type of mutation is this?

Accepted Answer

Transition

DNA Structure, Function, and Genetic Material: Study Notes for Genetics (BIOL 260)

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