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Assertion (A):	The newly formed mRNA has the same sequence as the coding stand of transcriptional unit with uracil present in place of thymine.
Reason (R):	The rule of complementarily guides the formation of DNA and RNA.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True and (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

Subtopic: DNA Double Helix |

57%

Level 3: 35%-60%

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Assertion (A):	DNA has two chains having antiparallel polarity.
Reason (R):	In one chain of DNA at one end has a free phosphate moiety 5' end of ribose sugar and at other end the ribose has a free 3' OH group.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A)
2.	Both (A) and (R) are true and (R) is not the correct explanation of (A)
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Subtopic: DNA Double Helix |

Level 4: Below 35%

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Which of the following is always true concerning the base composition of DNA?

1.	In each single strand, the number of adenine residues equals the number thymine residues.
2.	In each single strand, the number of adenine residues equals the number of guanine residues.
3.	In a molecule of double stranded DNA, the ratio of adenine residues to thymine residues equals the ratio of cytosine residues to guanine residues.
4.	In a molecule of double stranded DNA, the number of adenine residues plus thymine residues equals the number of cytosine residues plus guanine residues.

Subtopic: DNA Double Helix |

56%

Level 3: 35%-60%

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