Which type of animal cell lacks both mitochondria and endoplasmic reticulum?

$(a)$ List any two structural differences and two similarities between a plant cell and an animal cell.
$(b)$ What would happen if an animal cell is kept in distilled water for $24$ hours?

What is a nucleoid?

Organelle other than nucleus,containing $DNA$ is

Name the smallest known cell.

The proteins and lipids,essential for building the cell membrane,are manufactured by