Multiple Choice QuestionsAssertion : Plasmids are double stranded extrachromosomal DNA.
Reason : Plasmids are possessed by eukaryotic cells.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both the assertion and reason are false.
Extranuclear genes occurs in
plastids and are not inherited
plasmid and are not inherited
mitochondria and are inherited by female
mitochondria and are inherited by male
Radio-tracer technique shows that DNA is in
single-helix stage
double-helix stage
multi-helix stage
none of these
A point mutation comprising the substitution of a purine by pyrimidine is called
transition
translocation
deletion
transversion
Assertion : Watson and Crick provided experimental proof of semiconservative nature of DNA replication.
Reason : DNA polymerase binds nucleotides in replication.
If both Assertion and Reason are true and Reason is the correct explantion of Assertion
If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If Assertion is false but Reason is true.
D.
If Assertion is false but Reason is true.
Watson and Crick suggested the double helical structure of DNA. Semiconservative nature of DNA replication was proved by Messelson and Stahl by using heavy isotope of nitrogen (15N).
DNA polymerase III establishes phosphodiester linkages between the adjacent deoxyribo-nucleoside phosphate in presence of ATP/GTP, TPP and Mg2+. It produces a new strand of DNA. DNA polymerase binds nucleotides in 5'-3' direction.
Assertion : Clones are a group of organisms of identical genotype, produced by a single parent through asexual means.
Reason : Clones exhibit high genetic variations.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both the assertion and reason are false.
Assertion : The mRNA attaches itself to the ribosome via its 3' end.
Reason : The mRNA has F-capsular nucleotide and bases of lagging sequence.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both the assertion and reason are false.
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