Concept 3

Question 1

• The sequential events of the cell cycle are directed
• like a clock
• regulated by both internal and external controls

Answer 1

Cell cycle control system

Question 2

Do not respond normally to body’s control mechanism

Answer 2

Cancer cell

Question 3

•Where the cell cycle stops
• until a go ahead signal is received

Answer 3

Checkpoint

Question 4

Switching into nondividing state if the cell does not receive the go ahead signal is called as

Answer 4

G0

Question 5

•Invade surrounding tissues and can metastasize
• exports cancer cells to other parts of the body

Answer 5

Malignant tumors

Question 6

Explain the process of the cell cycle control system

Answer 6

For many cell, G1 seems to be the most important because if a cell receives a go-ahead signal at the G1 checkpoint, it will usually complete the S, G2, and M phase but if the cells does not receive a go-ahead signal, it will exit the cycle then switching into a nondividing state called as the G0.

Question 7

What are the reason why cancer cell may not need a growth factors to grow and divide?

Answer 7

• they may make their own growth factor
• they may convey a growth factor signals without the presence of the growth factor
• they may have an abnormal cell cycle control system

Question 8

Abnormal cell remains at the original site

Answer 8

Benign tumor