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.
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..
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Unit 4 Chapter 10: Molecular Basis of Inheritance — Important Questions & Answers
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.
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.
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.
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%.
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.
The genetic code is read sequentially without any gaps or 'commas' between codons.