Testosterone, which is a steroidal hormone, has the following structure.

The total number of asymmetric carbon atom/s in testosterone is ____________.

Total number of tripeptides possible by mixing of valine and proline is ___________

Uracil is a base present in RNA with the following structure. % of N in uracil is ___________

Given:

Molar mass N = 14 g mol$$^{-1}$$

O = 16 g mol$$^{-1}$$

C = 12 g mol$$^{-1}$$

H = 1 g mol$$^{-1}$$