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5.Molecular Basis of Inheritance
hard
Assertion : $DNA$ is associated with proteins.
Reason : $DNA$ binds around histone proteins that form a pool and the entire structure is called a nucleosome.
A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.
(AIIMS-2013)
Solution
A chain of $DNA$ has $140$ base pairs, make $1\frac {3}{4}$ turns and twist around a histone octamer forming nucleosome. The core of nucleosome consists of $4$ histones $H_2A,\,H_2B,\,H_3$ and $H_4$.
Standard 12
Biology
