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Assertion and Reason questions





Read the Assertion and Reason carefully to mark the correct option out of the options given below:
If both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion.
(b) If both the Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) If the Assertion is true but the Reason is false.
(d) If both the Assertion and Reason are false
Question 1.
Assertion :Transcription is the mode in which DNA passes its genetic information to RNA.
Reason : Transcription takes place in the cytoplasm of eukaryotic cells.

Question 2.
Assertion: Viruses having shorter life span, mutate and evolve faster.
Reason: Viruses have generally RNA genome.

Question 3.
Assertion : The RNA molecules are essential for cell function in both prokaryotes and eukaryotes.
Reason : They play an important role in protein synthesis.

Question 4.
Assertion: The genetic codes are commaless.
Reason: Genetic codes are overlapping.

Question 5.
Assertion :'Split genes' concept is applicable only to the prokaryotes.
Reason : Prokaryotic genome is divided into exons and introns.

Question 6.
Assertion: DNA caused the transformation.
Reason: Digestion with DNase inhibits transformation.

Question 7.
Assertion :The hnRNA in humans has exons and introns.
Reason : The primary transcript produced in eukaryotes is translated without undergoing any modification or processing.

Question 8.
Assertion :The two strands of DNA are antiparallel
. Reason : Only antiparallel polynucleotides form a stable double helix.

Question 9.
Assertion: RNA was the first genetic material.
Reason: Essential life processes (such as metabolism, translation, splicing, etc.) evolve around RNA.

Question 10.
Assertion :DNA fingerprinting is also known as genetic fingerprinting.
Reason : It was developed by James Watson, the first director of human genome project.

Question 11.
Assertion :A single mRNA strand is capable to produce different polypeptide chains.
Reason : The mRNA strand has terminator codons.

Question 12.
Assertion: Enzymes required for DNA replication are efficient enzymes
Reason: They can polymerise large number of nucleotides in very short time

Question 13.
Assertion :Ribosomal RNA is synthesized in the cytoplasm of the cell.
Reason : It is translated with the enzyme RNA polymerase III.

Question 14.
Assertion : Z-DNA follows a zig-zag course.
Reason : Z-DNA is left handed.

Question 15.
Assertion : The operon is a unit of gene expression.
Reason : Lac operon in E. coli is an inducible control.



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