Cytokinesis in Animal and Plant Cells

What proteins are primarily involved in forming the contractile rings during animal cell cytokinesis?

• Hemoglobin and Insulin

• Collagen and Keratin

• Actin and Myosin

• Elastin and Fibronectin

What happens to the cleavage furrow as the contractile rings contract?

• It deepens

• It disappears

• It expands

• It solidifies

What structure forms at the equator of plant cells to facilitate cytokinesis?

• Mitotic Spindle

• Cell Plate

• Chloroplast

• Centriole

How do plant cells differ from animal cells in their cytokinesis process?

• Use of cell plate

• Use of microtubules

• Absence of cell division

• Use of cleavage furrow

What is the primary component of the new cell walls formed in plant cells?

• Lignin

• Chitin

• Cellulose

• Pectin

What follows the formation of the cell plate in plant cells?

• Shrinkage of the nucleus

• Expansion of the vacuole

• Formation of the secondary cell wall

• Disintegration of the cell membrane

What is the middle lamella made of in the newly formed plant cell walls?

• Lipids

• Proteins

• Carbohydrates

• Nucleic acids

Which phase do nerve and muscle cells of adult humans typically enter, exiting the cell cycle?

• S Phase

• G1 Phase

• M Phase

• G0 Phase

What is the role of regulatory proteins in the cell cycle?

• They digest excess cell organelles

• They synthesize DNA

• They regulate the timing of cell cycle events

• They transport substances across the cell membrane

Which cells in the human body are continually dividing to replace worn-out cells?

• Liver cells

• Skin and intestinal lining cells

• Brain cells

• Heart muscle cells