NEET Class 12 Biology MCQ – Molecular Basis of Inheritance


This set of Class 12 Biology Chapter 6 Multiple Choice Questions & Answers (MCQs) focuses on “Molecular Basis of Inheritance” for NEET Preparation.

1. Which of the following is not a type of RNA?
a) mRNA
b) tRNA
c) rRNA
d) sRNA
View Answer

Answer: d
Explanation: There are three different types of RNA. They are mRNA (messenger RNA), rRNA (ribosomal RNA) and tRNA (transfer RNA). sRNA is a small ribosomal RNA. They are produced by the bacterium. The three different types of RNA are required for the synthesis of protein.

2. What is the role of tRNA?
a) It provides the template strand
b) It brings the amino acids and reads the genetic code
c) It plays a catalytic role during translation
d) It plays a structural role during translation
View Answer

Answer: b
Explanation: The role of mRNA is to provide the template strand. The role of tRNA is to bring the amino acids and read the genetic code. rRNA plays the structural and catalytic role during the process of translation.

3. Which of the following enzyme binds to the promoter and initiates the process of transcription?
a) DNA polymerase
b) Lipase
c) RNA polymerase
d) Lysozyme
View Answer

Answer: c
Explanation: The RNA polymerase binds to the promoter region of the DNA molecule. After the attachment of the RNA polymerase enzyme to the promoter, the process of transcription is being initiated.
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4. What happens when the polymerase enzyme reaches the terminator region during transcription?
a) The nascent RNA falls off
b) The nascent DNA falls off
c) The nascent protein falls off
d) The nascent enzyme falls off
View Answer

Answer: a
Explanation: During the termination stage of transcription process, the nascent RNA falls off. This is observed when the polymerase enzyme reaches the terminator region. Following this, the RNA polymerase enzyme also falls off.

5. Which of the following stage is catalyzed by the RNA polymerase enzyme?
a) Initiation
b) Elongation
c) Termination
d) Monocistronic
View Answer

Answer: b
Explanation: There are three stages in the transcription process. They are initiation, elongation and termination. Among these three, the stage of elongation is catalyzed by the RNA polymerase enzyme.
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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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