Which of the following sets of cell organelles contain $DNA$?

Which of the following statements is incorrect?

Write the functions of the following:
$(a)$ Centromere
$(b)$ Cell wall
$(c)$ Smooth $ER$
$(d)$ Golgi apparatus
$(e)$ Centrioles

Which of the following pairs represents organelles that lack a unit membrane?

Which of the following structures is formed by the collective functioning of all membranous organelles in terms of their structure and function?

In the given hierarchy of biological organization: $(P) \rightarrow \text{Subatomic particles} \rightarrow \text{Atoms} \rightarrow \text{Molecules} \rightarrow (Q) \rightarrow \text{Cells} \rightarrow \text{Tissues}$,what do $(P)$ and $(Q)$ represent respectively?