Calculate the volume occupied by a particle in fcc unit cell if volume of unit cell is $1.6 \times 10^{-23} \mathrm{~cm}^3$.

Which amino acid from following contains $-\mathrm{CH}_3$ as side chain?

Which from following medicinal properties is exhibited by curcumin?

Which is the correct increasing order of atomic radii of $\mathrm{Na}, \mathrm{K}, \mathrm{Mg}, \mathrm{Rb}$ ?