Click on a lesson name to select. State Standard 2E. Compare the advantages of sexual reproduction and asexual reproduction in different situations.

Click on a lesson name to select.

State Standard

2E. Compare the advantages of sexual reproduction and asexual reproduction in

different situations.

Cellular Growth (9.1)

9.1 Cellular Growth

Ratio of Surface Area to Volume

Chapter 9 Cellular Reproduction

Why Do Cells Need to Divide?

Cellular Reproduction

As the cell grows, its volume increases much more rapidly than the surface area.

The cell might have difficulty getting enough nutrients in and getting enough waste out.

The cell might have difficulty communicating instructions across long distances within a large cell.

Chapter 9

9.1 Cellular Growth

If a cell gets too large…

Why Do Cells Need to Divide? – Cont’d

The Cell Cycle

Cell division prevents the cell from becoming too large.

It also is the way the cell reproduces so that you grow, heal certain injuries, & replace worn out cells.


Cells reproduce by a cycle of growing and dividing called the cell cycle.

Chapter 9

9.1 Cellular Growth

Interphase is the stage during which the cell grows, carries out cellular functions, and replicates.

Mitosis is the stage of the cell cycle during which the cell’s nucleus and nuclear material divide.

Cellular ReproductionChapter 9

9.1 Cellular Growth

Cytokinesis is the method by which a cell’s cytoplasm divides, creating a new cell.

The Cell Cycle – Cont’d


Interphase – Stage G1

The first stage of interphase, G1

The cell is growing, carrying out normal cell functions, and preparing to replicate DNA.

Chapter 9

9.1 Cellular Growth


Interphase – Stage S

The cell copies its DNA in preparation for cell division.

Chapter 9

9.1 Cellular Growth


Interphase – Stage G2

The cell prepares for the division of its nucleus.

Chapter 9

9.1 Cellular Growth

9.1 Cellular Growth & Regulation


Normal Cell Cycle

Different proteins including cyclins time and control the life & activities of the cell.

The cell cycle has built-in checkpoints that monitor the cycle and can stop it if something goes wrong.

Chapter 9


Abnormal Cell Cycle: Cancer

Cancer is the uncontrolled growth and division of cells.

Cancer cells can kill an organism by crowding out normalcells, resulting in the loss of tissue function.

Chapter 9

9.1 Cellular Growth & Regulation


Causes of Cancer

The changes that occur in the regulation of cell growth and division of cancer cells are due to mutations.

Various environmental factors can affect the occurrence of cancer cells.

Chapter 9

9.1 Cellular Growth

1. A2. B3. C4. D

CDQ 3

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Chapter Diagnostic Questions

Chapter 9

A. cytokinesis

B. interphase

C. apoptosis

D. mitosis

Which is not a phase of the cell cycle?

1. A2. B3. C4. D

FQ 1

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Which can more efficiently supply nutrients and expel waste products?

A. larger cells

B. smaller cells

C. cells with lower surface area to volume ratio

D. cells shaped like a cube

9.1 Formative Questions

1. A2. B3. C4. D

FQ 2

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At what stage does a cell spend most of its life?

A. cytokinesis

B. interphase

C. mitosis

D. synthesis


1. A2. B3. C4. D

FQ 3

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What happens in the cell during cytokinesis?

A. The cell grows and carries

out normal functions.

B. The cell copies its DNA and forms chromosomes.

C. The cell’s nucleus and nuclear material divide.

D. The cell’s cytoplasm divides.


1. A2. B3. C4. D

FQ 4

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In what stage of the cell cycle does the cell’s replicated genetic material separate?

A. cytokinesis

B. interphase

C. mitosis

D. prophase


1. A2. B3. C4. D

FQ 8

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Which of these cancer-causing substances or agents is impossible to avoid completely?

A. chemicals such as asbestos

B. food and drinks that the FDA warns may contain carcinogens

C. tobacco and second-hand smoke

D. ultraviolet radiation from the Sun


1. A2. B3. C4. D

CAQ 3

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What is the role of cyclins in a cell?

A. to control the movement of microtubules

B. to signal for the cell to divide

C. to stimulate the breakdown of the nuclear membrane

D. to cause the nucleolus to disappear

Chapter Assessment Questions

1. A

2. B

3. C

STP 1


Which cell has the lowest ratio of surface area to volume?

AB

C

Standardized Test Practice

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1. A2. B3. C4. D

STP 2

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At what stage of interphase does the cell take inventory and make sure it is ready for the division of its nucleus?

A. G1

B. S

C. G2

D. M

1. A2. B3. C4. D

STP 3

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Which occurs in plant cells but not animal cells during the cell cycle?

A. formation of a cell plate

B. formation of microtubules

C. formation of a cleavage furrow at the equator of the cell

D. movement of chromosomes to the poles of the cell

1. A

2. B

STP 4



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Multiple changes in DNA are required to change an abnormal cell into a cancer cell.

A. true

B. false

1. A2. B3. C4. D

STP 5

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Which is not a condition that can result in cancer?A. a failure in the control

mechanisms that regulate the cell cycle

B. a failure in the repair systems that fix changes or damage to DNA

C. a failure of the spindle fibers to move chromosomes

during mitosisD. mutations or changes in

segments of DNA that control protein production


Visualizing the Cell Cycle

Animation


Click on a lesson name to select. State Standard 2E. Compare the advantages of sexual reproduction and asexual reproduction in different situations.

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