Which of the following is the smallest cell?

The main area of various types of activities of a cell is

What is the full form of the unit $(1) \, \text{nm}$?

Which theory is most widely accepted for the physical structure of protoplasm?

$(P) \rightarrow$ Subatomic particles $\rightarrow$ Atoms $\rightarrow$ Molecules $\rightarrow (Q) \rightarrow$ Cells $\rightarrow$ Tissues. Which levels do $(P)$ and $(Q)$ represent in the given hierarchy of biological organization?

The characteristics of a cell depend on which of the following?