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

Which of the following represents a nucleoside?

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

The correct sequence of $\alpha$-amino acids,hormone,vitamin,carbohydrates respectively is

Oxidation of glucose is one of the most important reactions in a living cell. What is the number of $ATP$ molecules generated in cells from one molecule of glucose?

Aspartame is unstable at cooking temperature. Where would you suggest aspartame to be used for sweetening?