B.5(C) Quiz 1 Cancer cells

Cells stop dividing for several reasons, including: A lack of positive external signals. The cell senses that it is surrounded on all sides by other cells-contact dependent inhibition. Most cells seem to have a pre-programmed limit of the number of times they can divide. Cancer cells however are different, Which of these properties is found only in cancer cells?

• Unregulated cell division

• Infect a cell and steal its nutrients

• Response to signals outside of the cell

• Presence of mitochondria

• Need a host to reproduce

Normal cells have a contact inhibition feedback mechanism that

prevents the cells from replicating when other cells are touched.

A diagram of cells with contact inhibition and cells without contact

inhibition is shown. Which statement best describes what will happen to cells in an

organism that lack contact inhibition?

• The cells will continue to grow, causing a tumor in the body.

• The cells will replicate normally, replacing body cells that die.

• The cells will replicate until the food supply for each cell is used,

  causing each cell to die.

• The cells will stop replicating once one layer is produced, as other

  body cells will crowd them out.

• The cells will kill any cells they come in contact with

During the cell cycle, proteins called cyclins bind to enzymes that send signals for the cell to

progress through stages of cell replication. At the end of this cycle, the cyclins degrade to

prevent further signaling for the cell to divide. Uncontrolled production of cyclins will most likely result in -

• the formation of tumors

• the immediate death of the cell

• the transfer of cyclins to other cells

• the formation of haploid cells

• A cell with no mitochondria for energy

When cells lose their ability to regulate the cell cycle, they can divide at an accelerated rate.

and form a mass of cells. This mass of cells is referred to as ​a ​​ (a)  

• gland
• tumor.
• organ
• virus
• bacteria cell
• embryotic cell
• stem cell

The uncontrolled division of cells that results in malignant growth is called

• tissues
• cancer

• mitosis

• anaphase
• lytic