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IB DP Biology Questions

2.2 DNA and RNA Structure

Question 1

Which of the following scientists did not directly contribute to the discovery of the DNA double helix structure?

A. Rosalind Franklin

B. James Watson

C. Gregor Mendel

D. Francis Crick

Question 2

Which base does RNA have that DNA does not?

A. Adenine

B. Thymine

C. Uracil

D. Cytosine

Question 3

What is the role of helicase in DNA replication?

A. Synthesizing new DNA strands

B. Unwinding the DNA double helix

C. Joining Okazaki fragments

D. Modifying RNA molecules

Question 4

Which type of RNA is involved in bringing amino acids to the ribosome?




D. snRNA

Question 5

What is the significance of the antiparallel strands in DNA structure?

A. They allow for complementary base pairing

B. They prevent DNA replication

C. They facilitate RNA modification

D. They inhibit protein synthesis

Question 6

a) Describe the discovery of the DNA structure by Watson, Crick, Wilkins, and Franklin, highlighting the significance of the double helix and antiparallel strands. [4]

b) Explain the importance of base pairing (A-T, C-G) in DNA structure for information storage. [3]

Question 7

a) Discuss the differences between DNA and RNA, focusing on the sugar component, bases, and structure. [4]

b) Explain the roles of different types of RNA (mRNA, tRNA, rRNA) in protein synthesis. [3]

Question 8

a) Discuss the role of helicase and DNA polymerase in the process of DNA replication. [3]

b) Explain the concept of leading and lagging strands and the formation of Okazaki fragments during DNA replication. [4]

Question 9

a) Elaborate on the contribution of Rosalind Franklin in the discovery of the DNA double helix structure. [3]

b) Discuss the significance of the antiparallel nature of DNA strands in the replication process. [3]

c) Explain how the specificity of base pairing is essential for the accurate transmission of genetic information. [4]

Question 10

a) Compare the structure of DNA and RNA, highlighting the differences in sugar, bases, and strand configuration. [4]

b) Discuss the different types of RNA and their respective roles in the process of protein synthesis. [4]

c) Explain the importance of RNA in translating the genetic code stored in DNA into functional proteins. [3]

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