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Copy of 4.) DNA Structure and Replication Questions (5/28/2026)

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

Explain what is happening to the bottom DNA molecule, include the enzymes and proteins that are involved.

I will have to grade this.

Question 2
2.

Explain what is happening to the DNA molecule, include the enzymes that 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 13
13.

Click on the box that surrounds a complete and correct nucleotide.

Question 14
14.
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 15
15.

Why is DNA replication called semi-conservative?

I must grade this.

Question 16
16.

What does it mean that the two strands of DNA molecule are complementary?

I must grade this.

Question 17
17.

Question 18
18.
Question 19
19.

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

Note the pattern of the hydrogen bonds (the number of dotted-lines) between those already labeled.

I must grade this.

Use the abbreviations
Adenine (A)
Thymine (T)
Guanine (G)
Cytosine (C)
Question 3
3.
Nitrogenous base _______
Question 4
4.
Nitrogenous base _______
Question 5
5.
Nitrogenous base _______
Question 6
6.
Nitrogenous base _______
Question 7
7.
Nitrogenous base _______
Question 8
8.
Nitrogenous base _______
Question 9
9.
_______
Question 10
10.
_______
Question 11
11.
_______
Question 12
12.
How many different varieties of #11 are there? _______
Reorder the following steps from beginning to end.
The DNA double helix breaks or unzips down the middle between the base pairs.
The enzyme DNA polymerase moves along the exposed strands and adds complementary nucleotides to each nucleotide in each existing strand.
A complementary strand is created for each of the two strands of the original double helix.
Two new identical DNA molecules have been produced.
Below is one-half of a DNA molecule.
Create the complementary strand (you must use UPPERCASE LETTERS).

Use the abbreviations
  • Adenine (A)
  • Thymine (T)
  • Guanine (G)
  • Cytosine (C)

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_______
Match each item with its correct description.
DNA Ligase
Unwinds and separates the double-stranded DNA
Topoisomerase
Adds complementary DNA nucleotides to a growing DNA strand
DNA Polymerase
Joins Okazaki fragments on the lagging strand
DNA Helicase
Synthesizes a short RNA primer
Primase
Relieves tension in the DNA strands ahead of the replication fork.