Cell Cycle Control

This video tutorial explains how cells divide, focusing on the role of chromosomes. It covers the cell cycle, which includes growth, DNA replication, and mitosis, leading to cytokinesis. The video details how DNA condenses into chromosomes, the duplication process, and how chromosomes are divided into daughter cells. The tutorial emphasizes the importance of cell division for growth, development, and repair in multicellular eukaryotic organisms.

Why do multicellular eukaryotic organisms need a continuous supply of new cells?

• To produce energy

• To increase their lifespan

• For growth, development, and repair

• To maintain their size

What are the three main stages of the cell cycle?

• DNA replication, mitosis, and meiosis

• Growth, mitosis, and meiosis

• Growth, DNA replication, and cytokinesis

• Growth, DNA replication, and mitosis

What happens during the growth stage of the cell cycle?

• The DNA condenses into chromosomes

• The cell increases in size and duplicates its organelles

• The chromosomes line up in the center of the cell

• The cell divides into two

How many pairs of chromosomes do humans have?

• 22 pairs

• 46 pairs

• 23 pairs

• 24 pairs

What is the significance of chromosome pairs in eukaryotic cells?

• They ensure genetic diversity

• They allow for the duplication of genetic material

• They determine the cell's size

• They control the cell's energy production

During mitosis, what happens to the chromosomes?

• They dissolve into the cytoplasm

• They duplicate and form a circle

• They line up along the center of the cell and are pulled apart

• They condense into a single strand

What is the role of spindle fibers during mitosis?

• To dissolve the nuclear membrane

• To duplicate the chromosomes

• To pull the chromosomes apart

• To condense the DNA

What is cytokinesis?

• The alignment of chromosomes in the cell

• The final stage of cell division where the cell splits into two

• The division of the cell's nucleus

• The process of DNA replication

What ensures that the two daughter cells are identical?

• The equal distribution of cytoplasm

• The size of the parent cell

• The duplication and equal division of chromosomes

• The presence of spindle fibers

What can the resulting daughter cells do after cytokinesis?

• They can only repair damaged tissues

• They can contribute to growth, development, or repair

• They can only undergo meiosis

• They can only produce energy