Cell Cycle and Mitosis

Which of these must occur during the S phase of the cell cycle so that two daughter cells can be produced during M phase?

• The DNA must be replicated

• The chromosomes must be joined

• The cytoplasm must be separated

• The cell membrane must be expanded

At the end of the cell cycle cells produce two daughter cells from one parent cell. Growth is achieved through the addition of new cells by mitosis and cell division. As daughter cells form, an organism grows in size. Which statement most likely describes the daughter cells produced by mitosis?

• The daughter cells are genetically identical to the parent cell.
• The daughter cells are genetically different from the parent cell.
• The daughter cells are smaller in size than the parent cell.
• The daughter cells are larger in size than the parent cell.

Which statement best describes a difference between cell division in plant and animal cells?

• Animal cells divide by mitosis, while plant cells divide by meiosis
• Plant cells form a cell plate during cytokinesis, while animal cells do not
• Animal cells have a cell wall that splits during cell division, while plant cells do not
• Plant cells do not undergo cell division, while animal cells do

1. Chromosomes align in the middle of the cell at the equator.

2. The nuclear membrane breaks down and chromosomes become visible.

3. Two nuclear membranes form two nuclei and cytokinesis is completed.

4. The chromosome pairs separate and move apart to opposite poles.

Which of the following is the correct sequence of events in mitosis?

• 3,2,1,4

• 1,3,2,4

• 4,3,2,1

• 2,1,4,3

Which of the following cells would most likely result from the uncontrolled cell division during the cell cycle?

• Nerve cells
• Blood cells
• Muscle cells
• Cancer cells

DNA is copied during replication which is during the Synthesis phase of the cell cycle. Why is this important to the growth of the organism?

• It allows the organism to replace damaged or lost cells and thus helps in healing and growth.
• It helps the organism to evolve and adapt to new environments.
• It increases the lifespan of the organism.
• It enhances the physical strength of the organism.

Which is a characteristic of the group of diseases known as cancer?

• It is caused by bacteria
• It is a group of diseases characterized by uncontrolled growth and spread of abnormal cells
• It is a disease caused by lack of vitamins
• It is a disease that only affects the elderly

A photomicrograph of onion root tip cells during mitosis is shown here.

Which phase of mitosis is occurring in the cell indicated by the arrow?

• Prophase

• Metaphase

• Anaphase

• Telophase

People who have leukemia, a cancer that affects white blood cells, are often given Cytarabine. This drug inhibits the synthesis of DNA. Which phase of the cell cycle is most affected by Cytarabine?

• G1 phase
• S phase
• G2 phase
• M phase

After completion of the cell cycle, which term best describes the two cells that were made?

• Identical
• Different
• Parental
• Sister