A short solenoid (length $L$ and radius $r$, with $n$ turns per unit length) lies well inside and on the axis of a very long, coaxial solenoid (radius $R$ and $N$ turns per unit length, with $R>r$ ). Current $I$ flows in the short solenoid. Choose the correct statement.

The diagram shows a current carrying wire passing through the centre of a square card board. The magnetic field at points $A$, $B$  and $C$ is:

$\mathrm{A}$: Composition of cell membrane of Erythrocyte
$\mathrm{B}$: No. of strands present in peripheral fibril of centriole
$\mathrm{C}$: No. of nucleotides in a typical nucleosome

$\mathrm{I})$ $60\%$ protein, $40\%$ Lipids
$\mathrm{II})$ $52\%$ protein, $40\%$ Lipids
$\mathrm{III})$  Phosphoglycolipids
$\mathrm{IV}) 3$
$\mathrm{V}) 200$
$\mathrm{VI}) 145$

Select the option that correctly matches $\mathrm{A}, \mathrm{B} \mathrm{and} \mathrm{C}$ respectively with $\mathrm{I}-\mathrm{VI}$.

The given diagram represents :

Read the following statements and choose the set of correct statements:
(a) Euchromatin is loosely packed chromatin.
(b) Heterochromatin is transcriptionally active.
(c) Histone octamer is wrapped by negatively charged DNA in the nucleosome.
(d) Histones are rich in lysine and arginine.
(e) A typical nucleosome contains 400bp of DNA helix.

Choose the correct answer from the options given below: