Cell Division

What role does the mitotic spindle (spindle fibers) play in cell division?

• It breaks down the nuclear membrane

• It replicates DNA

• It separates the chromosomes

• it divides the cell

When a cell undergoing mitosis is viewed under the microscope, the chromosomes are being pulled to opposite sides of the cell. What phase is it in?

• Prophase

• Metaphase

• Anaphase

• Telophase

In which phase of the cell cycle does the cell grow and prepare for DNA replication

• G1

• S

• G2

• M

What happens when cancer occurs?

• control of the cell cycle becomes impaired

• apoptosis

• cells get stuck in G1

• cells cannot divide

Colchicine is a chemical that freezes cells in metaphase by preventing chromosomes from moving to opposite sides of the cell. It is most likely affects which part of the cell?

• chromosome structure

• spindle fibers

• cell membrane

• nuclear membrane

What do cells divide

• to allow for diffusion of nutrients and waste

• to produce new cells during an organism's growth

• to replace damaged cells

• all of the above

If you look at a cell and the nuclear envelope is gone and cells have condensed into chromosomes, the cell is in what stage?

• prophase

• metaphase

• anaphase

• telophase

What structure is found in prokaryotic cells, but not in eukaryotic cells?

• a singular, circular chromosome

• a chromosome wrapped around many histones

• a chromosome found in the nucleus

• mitotic spindle (spindle fibers)

Cell differentiation is when:

• cells undergo mitosis

• cells become specialized (into skin cells, nerve cells, etc.)

• cells undergo apoptosis

• cells become cancerous

How does cell differentiation occur?

• certain genes are activated

• p53 triggers apoptosis

• cyclins are activated to progress through the cell cycle

• the mitotic spindle pulls chromosomes to opposite sides of the cell