What are chromosomes made of?

Identify and name the following cell structures.
$(a)$ The undefined nuclear region of a prokaryotic cell.
$(b)$ The site of energy release inside the cell.

The raisins added to porridge swell up after some time. Name the process involved.

When do chromatin fibres organize themselves into chromosomes?

How do substances like carbon dioxide $(CO_2)$ and water $(H_2O)$ move in and out of the cell?

$(a)$ What role do vacuoles play in a typical plant cell?
$(b)$ What will happen if the Golgi apparatus is removed from the cell?
$(c)$ Why is the inner membrane of mitochondria deeply folded?