(A) According to the Watson and Crick model of $DNA$ structure,the $DNA$ molecule exists as a double helix.In this structure,the two polynucleotide st

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(A) According to the Watson and Crick model of $DNA$ structure,the $DNA$ molecule exists as a double helix.In this structure,the two polynucleotide strands are coiled around a common axis.The diameter of the $DNA$ double helix is constant throughout its length.The distance between the two strands of the $DNA$ double helix is $20 \ \mathring A$ $(2 \ nm)$.

Class 12 Biology Molecular Basis of Inheritance The DNA

Easy

What is the distance between the two strands of $DNA$?

A
$20 \ \mathring A$
B
$34 \ \mathring A$
C
$32 \ \mathring A$
D
$10 \ \mathring A$

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Class 12 Questions

Class 12

Biology Questions

Chapter

Molecular Basis of Inheritance

Subtopic

The DNA

The backbone of a $DNA$ molecule is made up of

Easy

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Which complementary base pairing is present in the structure of $DNA$?

Easy

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In which part do different types of $DNA$ molecules vary?

Medium

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Match the number of nucleotides of the genome in Column $I$ with the organisms in Column $II$. Choose the correct option given below.
Column $I$ Column $II$
$(A) 5386$ nucleotides $(p) E. coli$
$(B) 48502$ bp $(q) \text{Man}$
$(C) 4.6 \times 10^6$ bp $(r) \text{Drosophila}$
$(D) 3.3 \times 10^9$ bp $(s) \phi \times 174 \text{ bacteriophage}$
$(t) \text{Bacteriophage lambda}$

Column $I$	Column $II$
$(A) 5386$ nucleotides	$(p) E. coli$
$(B) 48502$ bp	$(q) \text{Man}$
$(C) 4.6 \times 10^6$ bp	$(r) \text{Drosophila}$
$(D) 3.3 \times 10^9$ bp	$(s) \phi \times 174 \text{ bacteriophage}$
	$(t) \text{Bacteriophage lambda}$