Chapter 9 Review!

Cellular Reproduction

Directions

• Work in a group of 3-4 students • We will go group by group to answer a question.• If a group cannot answer a question correctly,

the first group to raise their hand and is called on may answer the question.

• There is no penalty for guessing. • Team with the most points at the end wins! • I may deduct points for disruptive behavior …

Here we go …

Good luck!

Which of the following explains why a cell's size is limited?

a. Volume increases faster than surface area.b. Surface area increases faster than volume.c. Homeostasis is disrupted by a cell that is too large.d. Both a and c

D

Why is the synthesis stage called this?

Because DNA is being replicated

Which of the graphs in Figure 9-3 shows the correct changes in the amount of DNA in a cell as

it moves through one cell cycle?

• C

AA B C D

The typical growth period of a cell occurs during which stage of the

cell cycle?G1

growth : G1 ::

a. mitosis : meiosisb. cytokinesis : Mc. mitochondria replication : Sd. DNA copying : S

A typical human cell contains 46 chromosomes. After mitosis and cell division, each of the two new cells formed from the original cell

a. gets 23 chromosomes.b. grows new chromosomes from existing DNA.c. gets a complete set of 46 chromosomes.d. None of the above

The longest phase of the cell cycle is …

Interphase

Mitosis is a process by which the …

Nucleus divides

What is the product of cell division?

Two new cells – identical genetic material

Which of the following shows the correct sequence of the cell

cycle?

a. C M G1 S G2c. G1 S G2 M Cb. S G1 G2 M Cd. None of the above

List the phases of mitosis in proper order

Prophase, metaphase, anaphase, telophase

Figure 5 shows which phase of mitosis?

• Telophase

Figure 3 shows which phase of mitosis?

• Metaphase

Figure 1 shows which phase of mitosis?

• Anaphase

This is a picture of which phase of mitosis?

• Prophase

By the end of prophase, each of the following has occurred except

a. tighter coiling of the chromosomesb. breaking down of the nuclear envelopec. disappearing of the nucleolusd. lining up of chromosomes in the cell

What is the role of the spindle in mitosis?

It helps separates the chromosomes

How is the alignment of chromosomes, shown in Figure

9-4, on the equatorial plate of the cell maintained?

a. They are always located there, since that is where the nucleus was.

b. Tension between opposite spindle fibers pulls them there.

c. The pressure of the cytoplasm moves them there.

d. The chromosomes are attracted to each other and meet there.

A stem cell has potential medical uses because …

It is not specialized in structure or function

Which of the cells depicted in the line graph in Figure 9-2 are most

likely cancerous?

• A

If cancer is present, what is the likely explanation for what happened to the cells depicted in the curves labeled B and D in

Figure 9-2? • a. They thrived with the

cancerous cells.• b. They were harmed by

radiation therapy.• c. They died off due to

natural causes.• d. They died off because

the cancerous cells deprived them of nutrients.

The cell cycle is regulated by…

Cyclins

Cancer cells can reproduce more quickly because they…

Spend less time in interphase

Cancer is caused by…

a. Cell-membrane damagec. Mutationb. Metabolic poisoningd. Immune-system damage

Which of the following is a factor that can stop normal cells from

growing?

a. contact with other cellsb. growth factorsc. a cut in the skind. cyclin that has been taken from a

cell in mitosis

Look at Figure 10-1. Which diagram shows cancer cells? How

do you know?

Explain how cancer cells are different from normal cells. Then, relate these

characteristics to the diagrams in Figure 10-

1.

Look at the cancer cells shown in Figure 10-1. What can happen if these cells are left untreated?

Explain the role that p53, a gene that regulates DNA synthesis, might have had in the growth and

division of the cells shown in each diagram in

Figure 10-1.

How might the cancer cells shown in Figure 10-1 be prevented from doing more harm to

the organism of which they are a part?

Our goal …

Is for EVERYONE to earn an 80% (a B or better!) on the exam!