Let $A$ and $B$ be two sets. Then $(A \cup B)' \cup (A' \cap B)$ is equal to:

Auxospores and hormocysts are formed respectively by

The length of an elastic string is $a$ metres when the longitudinal tension is $4 \ N$ and $b$ metres when the longitudinal tension is $5 \ N$. The length of the string in metres when the longitudinal tension is $9 \ N$ is

Boron halides behave as Lewis acids because of their nature.

Which nitrogenous base is present in $RNA$ but not in $DNA$?

Which of the following reagents will convert propionic acid to $1-propanol$?