Cell Biology and Structure

A plant cell wall is composed of an important substance known as cellulose.

Nucleolus is a non-membrane-bound structure that is composed of proteins and nucleic acids. It is the largest structure in the nucleus of eukaryotic cells, where it primarily serves as the site of ribosome synthesis and assembly.

Cell is the structural and functional unit of a living organism.

The living bodies, which are almost the same in both plant and animal cells are termed as organelles. Centrosome is found only in animal cells. Hence, it is not called as organelle.

Teh cell wall remains present only in plant celsl. It is totally absent in animals.

Mitochondria is known as the power house of the cell. It is a seat of aerobic respiration.

Plastid is a living part of a cell.

Endoplasmic reticulum is continuous with the cell membrane on the outside and the nuclear membrane on the inside. It is the supportive framework of a cell.

Red blood cells are circular and biconcave for easy passage through blood capillaries.

Nerve cells are the longest cells in nature.

Lysosomes are known as suicidal bags. They digest cartilages during the formation of bones.

They store water and other substances like food, pigments and waste products. They provide turgidity to the plant cell.

These are spindle-shaped structures present in planktonic bacteria. They provide buoyancy to these cells by decreasing their overall cell density.

These are impermeable structures. These structures protect bacteria from phagocytosis and desiccation.

It is a self-perpetuating lipoprotein complexe. It is present in form of grains, rods, or threads in the cytoplasm of most cells. It is supposed to function in cellular metabolism and secretion. So, it is the site of respiration in aerobic bacteria.