Multiple Choice QuestionsAssertion : 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.
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
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.
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
In eukaryotic genes, coding sequences are called
introns
exons
regulatory sequence
repetitive DNA
repetitive DNA
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
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
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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