Question 1

Which of the following best describes the structure of DNA as discovered by Watson and Crick?

Accepted Answer

A double-stranded helix with antiparallel strands and complementary base pairing

Question 2

Which of the following is NOT a component of a nucleotide found in DNA?

Accepted Answer

Uracil base

Question 3

If a DNA strand has the sequence 5'-ATTGCGGAAC-3', what is the complementary sequence?

Accepted Answer

3'-TAACGCCTTG-5'

Question 4

Which of the following statements correctly compares DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded

Question 5

Which chemical reaction joins nucleotides together to form nucleic acids?

Accepted Answer

Dehydration synthesis

Question 6

A scientist finds a nucleic acid strand with the bases adenine, cytosine, guanine, and uracil. What type of nucleic acid is this most likely?

Accepted Answer

RNA

Question 7

Which of the following best explains why RNA can have catalytic activity but DNA does not?

Accepted Answer

RNA's single-stranded structure allows it to fold into complex shapes, enabling catalytic activity

Question 8

During DNA replication, which enzyme is primarily responsible for adding new nucleotides to the growing DNA strand?

Accepted Answer

DNA polymerase

Question 9

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

Accepted Answer

Thymine

Question 10

What type of bond holds the two strands of DNA together?

Accepted Answer

Hydrogen bonds between nitrogenous bases

Question 11

If the DNA sequence 5'-ATTGCGGAAC-3' is transcribed into RNA, what will be the resulting RNA sequence?

Accepted Answer

5'-UAACGCCUUG-3'

Question 12

Which of the following best describes the backbone of a DNA molecule?

Accepted Answer

Alternating deoxyribose and phosphate groups

Question 13

How many different types of nucleotides are found in RNA?

Accepted Answer

Four

Question 14

Which of the following is a correct pairing of nitrogenous bases in DNA?

Accepted Answer

Adenine pairs with thymine

Question 15

Which of the following is a function of DNA in cells?

Accepted Answer

Storing genetic information

Question 16

Which of the following best describes the difference between a purine and a pyrimidine?

Accepted Answer

Purines have a double ring structure, pyrimidines have a single ring

Question 17

Which of the following is a real-world application of understanding DNA structure?

Accepted Answer

Developing forensic techniques for crime scene analysis

Question 18

Which of the following best explains the antiparallel nature of DNA strands?

Accepted Answer

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

Question 19

Which of the following is a correct description of a nucleotide?

Accepted Answer

A molecule composed of a sugar, a phosphate group, and a nitrogenous base

Question 20

Which of the following is a correct formula for the number of possible DNA sequences of length $$n$$?

Accepted Answer

$$4^n$$

Nucleic Acids: Structure, Function, and Replication

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