Cell wall

The video explains the differences in cell wall presence and composition among animal, plant, and bacterial cells. Animal cells lack cell walls, while plant cells have walls made of cellulose, and bacterial cells have walls made of peptidoglycan. Some algae and similar organisms use silica for their cell walls.

Which of the following structures is absent in animal cells?

• Cytoplasm

• Nucleus

• Cell wall

• Cell membrane

What is the primary component of plant cell walls?

• Chitin

• Peptidoglycan

• Cellulose

• Silica

Bacterial cell walls are mainly composed of which protein?

• Cellulose

• Keratin

• Collagen

• Peptidoglycan

Which organisms are known to construct their cell walls using silica?

• Algae

• Bacteria

• Fungi

• Plants

Silica is a component of cell walls in which type of organisms?

• Algae

• Animal cells

• Plant cells

• Bacterial cells