Question 1

Which feature of DNA structure is responsible for its ability to store genetic information and allow precise replication?

Accepted Answer

Its double helix with uniform diameter

Question 2

What is the correct orientation of the two strands in a DNA double helix?

Accepted Answer

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

Question 3

Which enzyme is responsible for unwinding the DNA double helix during replication?

Accepted Answer

Helicase

Question 4

Why does DNA have a uniform diameter throughout its double helix?

Accepted Answer

Because complementary base pairing matches purines with pyrimidines

Question 5

Which of the following best describes the role of the 3' hydroxyl group in DNA replication?

Accepted Answer

It is the site where new nucleotides are added by DNA polymerase

Question 6

What is the relationship between PCR (Polymerase Chain Reaction) and DNA replication?

Accepted Answer

PCR mimics the natural process of DNA replication but is performed in vitro

Question 7

Which of the following statements about eukaryotic chromosomes is correct?

Accepted Answer

They are linear and consist of DNA and proteins

Question 8

Chargaff's Rule states that in DNA:

Accepted Answer

$$[A] = [T]$$ and $$[G] = [C]$$

Question 9

Which structural feature of DNA allows proteins to interact with specific base pairs?

Accepted Answer

The major and minor grooves

Question 10

During DNA replication, which enzyme synthesizes the new DNA strand by adding nucleotides to the 3' end?

Accepted Answer

DNA polymerase

Question 11

What is the primary function of histone proteins in eukaryotic cells?

Accepted Answer

To package and condense DNA into chromatin

Question 12

Which of the following is NOT a function of DNA in the cell?

Accepted Answer

Catalyzing metabolic reactions

Question 13

A mutation in the DNA sequence can affect which of the following cellular processes?

Accepted Answer

Gene expression and phenotype

Question 14

Which of the following best describes the difference between prokaryotic and eukaryotic chromosomes?

Accepted Answer

Prokaryotic chromosomes are circular, eukaryotic chromosomes are linear

Question 15

Which of the following statements about DNA replication is TRUE?

Accepted Answer

DNA replication only occurs before cell division

Question 16

What is the significance of the antiparallel nature of DNA strands for replication?

Accepted Answer

It requires different mechanisms for leading and lagging strand synthesis

Question 17

Which of the following is a direct result of complementary base pairing in DNA?

Accepted Answer

The uniform diameter of the double helix

Question 18

Which scientist's work was crucial in determining the double helix structure of DNA using x-ray crystallography?

Accepted Answer

Rosalind Franklin

Question 19

Which of the following best describes the role of the template DNA strand during replication?

Accepted Answer

It serves as a guide for the synthesis of a complementary strand

Question 20

In the context of gene expression, what is the relationship between DNA, RNA, and polypeptides?

Accepted Answer

DNA is transcribed into RNA, which is translated into polypeptides

DNA Structure and Function: Foundations for Organic Chemistry and Biochemistry

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