 ]}

# Molecular Basis of Inheritance -CBSE Class 12th NCERT Solution

Get, detailed solutions to the questions of the chapter Electromagnetic induction from NCERT textbooks

Get, detailed solutions to the questions of the chapter Molecular Basis of Inheritance from NCERT textbooks. The objective is to helping students regarding the pattern of answering the question as per the cbse latest marking scheme.Cbse.jagranjosh.com provided you NCERT solutions for classes 12th math and science subjects. Some questions of this chapter are given here

Q. Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine.

Answer. Among the list listed above, Adenine, Thymine, Uracil and cytosine are nitrogenous bases. Cytidine and Guanine are nucleosides.

Q. If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.

Answer.Taking total number of nitrogenous base to be 100 then number of cytosine will be 20. By base pairing rule we know in DNA segments a cytosine make pairs with a guanine by 3-H bonds. So, the no. of guanine will also 20. After 20 to cytosine and 20 to guanine, 60 are left. We know adenine and thymine pairs among themselves through 2-H bonds. So, 60 will be divided among adenine and guanine equally (60? 2) = 30%. By the above calculation, it is clear that adenine amount would be 30%. 