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Unit 4 Chapter 10: Molecular Basis of Inheritance — Online MCQ Test

BOTANY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 4 Chapter 10: Molecular Basis of Inheritance with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY. This chapter covers: This chapter covers DNA RNA structure DNA replication transcription genetic code translation gene expression regulation lac operon Human Genome Project and DNA fingerprinting.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 4 Chapter 10: Molecular Basis of Inheritance — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY — Unit 4 Chapter 10: Molecular Basis of Inheritance, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which nitrogenous base is present in RNA but absent in DNA?
  • A. Adenine
  • B. Guanine
  • C. Uracil ✓
  • D. Cytosine
Answer: C. Uracil
RNA contains uracil instead of thymine, which is found in DNA.
The process of copying genetic information from one strand of DNA into RNA is termed as:
  • A. Replication
  • B. Transcription ✓
  • C. Translation
  • D. Reverse Transcription
Answer: B. Transcription
Transcription is the synthesis of RNA from a DNA template.
In the lac operon, the inducer molecule is:
  • A. Glucose
  • B. Galactose
  • C. Lactose ✓
  • D. Sucrose
Answer: C. Lactose
Lactose acts as an inducer by binding to the repressor protein, allowing transcription to occur.
If a double-stranded DNA has 20% Cytosine, what will be the percentage of Adenine?
  • A. 20%
  • B. 30% ✓
  • C. 40%
  • D. 60%
Answer: B. 30%
According to Chargaff's rule, G=C=20%, so A+T must be 60%, meaning A=30%.
Why is the genetic code described as 'comma-less'?
  • A. It has no punctuation marks
  • B. There are no intervening nucleotides between codons ✓
  • C. It is read in both directions
  • D. It only uses two letters per codon
Answer: B. There are no intervening nucleotides between codons
The genetic code is read sequentially without any gaps or 'commas' between codons.
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