10.3 Workbook Corrections.

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Presentation transcript:

10.3 Workbook Corrections

1. F - Cells tend to stop dividing when they come into contact with other cells.

2. F - Cell division slows down when the healing process nears completion.

3. F – Proteins called cyclins regulate the timing of the cell cycle in eukaryotic cells.

4. T – If chromosomes have not attached to spindle fibers during metaphase, an internal regulatory proteins will prevent the cell from entering anaphase

5. F – Growth factors are external regulatory proteins that speed up the cell cycle

6. T – Once apoptosis is triggered, a cell proceeds to self-destruct.

7. Cyclins – Tell a cell when to begin steps of cell cycle (growth, copy DNA, mitosis, cytokinesis) Internal regulatory proteins – stop a cell from going to next phase if internal events have not occurred (ex: can’t go to mitosis until chromosomes are replicated) External regulatory proteins – speed up cell cycle (ex: for embryonic growth or wound healing) or slow down cell growth (ex: so one body tissue’s growth doesn’t disrupt another’s)

8. Cancer is a disorder in which some of the body’s own cells lose the ability to control growth

9. Tumors may be malignant or benign. Malignant – cancerous, invade and destroy healthy tissues Benign – noncancerous, doesn’t spread

10. Rapidly dividing cancer cells take nutrients away from healthy tissues. This leads to disruption of the proper functioning of body organs that causes illness and may lead to death

11. Defects in genes that regulate cell growth and division causes cancer

12. Radiation disrupts the cancer cycle by interfering with the copying of DNA. Chemotherapy kills cancer cells (targets rapidly dividing cells)

13. Cancer cells do not respond to signals that regulate cell GROWTH Cancer cells form a mass of cells called a TUMOR Cancer cells may break loose and SPREAD throughout the body Cancer cells form tumors in other tissues by METASTASIS

14. The chemicals stop cell division in both cancer cells and healthy cells, such as ones that produce hair. With no new cells being added to the hair shafts, they break and fall out.

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