Which is correct about saccharin?

Acquired immune deficiency syndrome $(AIDS)$ is characterized by:

Which biological molecule in living organisms contains $Mg$ as an essential component?

The structure of the hormone thyroxine is given below. The percentage of iodine in thyroxine is $..........\%$. ($nearest$ $integer$)
($Given$ $molar$ $mass$ $in$ $g \ mol^{-1}: C: 12, H: 1, O: 16, N: 14, I: 127$)

Chemically,'digestion' is:

Which of the following represents a nucleoside?