Mitosis and Cytokinesis Concepts

The video tutorial explains the cell cycle, which includes interphase and mitotic cell division. Interphase is a period of cell growth and DNA replication, making up 90% of the cell cycle. Mitotic cell division involves nuclear division (mitosis) and cytoplasmic division. Mitosis is divided into four phases: prophase, metaphase, anaphase, and telophase. During prophase, chromosomes become visible, and the nuclear membrane breaks down. In metaphase, chromosomes align in the cell's center. Anaphase involves the separation of sister chromatids, and telophase sees the formation of new nuclear membranes. Cytoplasmic division differs in animal and plant cells, with animal cells constricting and plant cells forming a cell plate.

What is the primary activity during interphase?

• Chromosome alignment

• Cell division

• Nuclear membrane breakdown

• Cell growth and DNA replication

Which phase of mitosis involves the condensation of chromosomes?

• Metaphase

• Prophase

• Telophase

• Anaphase

Which phase of mitosis is characterized by the breakdown of the nuclear membrane?

• Metaphase

• Anaphase

• Telophase

• Prophase

During which phase do chromosomes line up in the center of the cell?

• Prophase

• Metaphase

• Anaphase

• Telophase

What happens to sister chromatids during anaphase?

• They align at the cell's equator

• They condense and become visible

• They separate and move to opposite poles

• They form new nuclear membranes

What is the role of spindle fibers during metaphase?

• They condense chromosomes

• They divide the cytoplasm

• They attach to chromosomes

• They form new nuclear membranes

What is the main event during telophase?

• Spindle fibers attach to chromosomes

• Chromosomes condense

• New nuclear membranes form

• Cytoplasm begins to divide

What happens to chromosomes during telophase?

• They condense and become visible

• They align at the cell's equator

• They separate and move to opposite poles

• They uncoil to become chromatin

How does cytokinesis occur in animal cells?

• Chromosomes align in the center

• The cell membrane constricts inward

• Spindle fibers contract

• A cell plate forms

What structure forms during cytokinesis in plant cells?

• Cell membrane

• Cell plate

• Nuclear envelope

• Spindle fibers