CELL STRUCTURES AND FUNCTION
CELL CYCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Mitosis
|
|
|
Synthesis
|
|
|
Gap 1
|
|
|
Gap 2
|
Detailed explanation-1: -Superficially, the connection between the cell cycle and cancer is obvious: cell cycle machinery controls cell proliferation, and cancer is a disease of inappropriate cell proliferation. Fundamentally, all cancers permit the existence of too many cells.
Detailed explanation-2: -Listen to pronunciation. (TOO-mer) An abnormal mass of tissue that forms when cells grow and divide more than they should or do not die when they should. Tumors may be benign (not cancer) or malignant (cancer).
Detailed explanation-3: -DNA Synthesis (S phase) In many cancer cells the number of chromosomes is altered so that there are either too many or too few chromosomes in the cells. These cells are said to be aneuploid. Errors may occur during the DNA replication resulting in mutations and possibly the development of cancer.
Detailed explanation-4: -In contrast, in a complete remission the tumor shrinks so much that at the end of treatment there is no longer any clinical evidence of disease by physical examination, by biochemical and radio-graphic evaluation, or by the patient’s symptoms.