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Copy of DNA Structure and Replication Questions (5/28/2026)

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Last updated about 2 hours ago
18 questions
Note from the author:
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Question 1
1.

Explain what is happening to the DNA molecule and what enzymes are involved.
I will have to grade this.

Question 2
2.

Explain what is happening to the DNA molecule and what enzymes are involved.
I will have to grade this.


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Identify the labeled parts of the nucleotide for 9-11.
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Question 12
12.

Identify a correct nucleotide in the image below.

Question 13
13.
a. In a single strand of DNA, the _______ on one nucleotide binds to the deoxyribose of the next nucleotide.

b. Chargaff's rules states that the DNA of any organism contains equal proportions of _______ and _______ and equal proportions of _______ and _______ (I have to regrade this).

c. Logical thinking using Chargaff's rules - In a strand of DNA, if the percentage of adenine was 20%, the percentage of guanine in the same strand must be _______ .

d. _______ bonds connect the nitrogen bases of one strand to the nitrogen bases of the other strand of DNA.
Question 14
14.

Why is DNA replication called semi-conservative?
I will have to grade this.

Question 15
15.

What does it mean that the two strands of DNA are complementary?
I will have to grade this.

Question 16
16.

Question 17
17.
Below is one-half of a DNA molecule. Create the complementary strand (USE UPPERCASE LETTERS).

A_______
T_______
G_______
C_______
A_______
A_______
A_______
T_______
T_______
G_______
C_______
T_______
C_______
A_______
C_______
C_______
G_______
G_______
G_______
G_______
A_______
T_______
C_______
A_______
G_______
Question 18
18.

Draggable itemarrow_right_altCorresponding Item
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For 3-8, identify the nitrogenous bases.

Note the pattern of the hydrogen bonds between those already labeled.
Question 3
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Question 4
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Question 5
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Question 6
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Question 7
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Question 8
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Question 9
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Question 10
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Question 11
11.
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Reorder the following steps from beginning to end.
The DNA double helix breaks or unzips down the middle between the base pairs.
A complementary strand is created for each of the two strands of the original double helix.
Two new identical DNA molecules have been produced.
The enzyme DNA polymerase moves along the exposed strands and adds complementary nucleotides to each nucleotide in each existing strand.
Match each item with its correct description.
Primase
Unwinds and separates the double-stranded DNA
DNA Helicase
Adds complementary nucleotides to a growing DNA strand
DNA Polymerase
Joins Okazaki fragments on the lagging strand
Topoisomerase
Synthesizes a short RNA primer
DNA Ligase
Relieves torsional strain ahead of the replication fork