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 Multiple Choice QuestionsMultiple Choice Questions

251.

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.


252.

In RNA thymine is replaced by

  • uracil

  • adenine

  • thiamine

  • guanine


253.

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


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254.

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.


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255.

Match the following and choose the correct combination from the options given.

Column I (Chemical compounds) Column II (Example)
A. Nitrogen base 1. RNA
B. Nucleoside 2. Thymidylic acid
C. Nucleotide 3. Cytidine
D. Nucleic acid 4. Uracil

  • A - 1; B - 2; C - 3; D - 4

  • A - 1; B - 3; C - 2; D - 4

  • A - 4; B - 3; C - 2; D - 1

  • A - 4; B - 1; C - 2; D - 3

  • A - 4; B - 1; C - 2; D - 3


256.

In eukaryotic genes, coding sequences are called

  • introns

  • exons

  • regulatory sequence

  • repetitive DNA

  • repetitive DNA


257.

Which site of the tRNA pairs through hydrogen bonding with the triplet codes on mRNA?

  • Codon

  • 5' end of tRNA

  • 3' end of tRNA

  • Anticodon

  • Anticodon


258.

Find the wrongly matched pair

  • Har Gobind Khorana - synthesized RNA molecules chemically

  • George Gamow - codon is triplet's

  • Meselson and Stahl - regulation of gene expression

  • Alec Jeffreys - DNA finger printing

  • Alec Jeffreys - DNA finger printing


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259.

In eukaryotes, RNA polymerase II transcribes

  • hnRNA

  • 18S rRNA

  • 28S rRNA

  • tRNA

  • tRNA


260.

Identify the wrong statement about DNA

  • The length of DNA is defined as the number of base pairs present in it

  • Cytosine is common to both DNA and RNA

  • In a nucleotide, the nitrogenous base is linked to a phosphate group

  • Thymine is chemically 5-methyl uracil

  • Thymine is chemically 5-methyl uracil


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