The development of colon cancer occurs slowly, and colon cancer is more frequently seen in the elderly than the young. This is most likely because
A) cancer cells don't have mitochondria, so they grow slowly.
B) usually six or more somatic mutations must occur to give rise to the cancer, which takes time.
C) cancer cells have to wait until new blood vessels grow into the area, which takes much time.
D) most cancer mutations interfere with mitosis, so cell division occurs more slowly.
Answer: B
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Answer the following statements true (T) or false (F)
1.The renal artery delivers blood to the pancreas. 2.The sinoatrial node, also called the pacemaker, sets the tempo of the heart beat. 3.An irregular heartbeat in which the ventricles do not fill completely could be due to a malfunction in the atriventricular node. 4.Capillary beds are networks of capillaries that connect arterioles and venules. 5.Blood clotting is prompted by signals from the central nervous system.
In order for a cancer to develop, cells must be capable of breaking away from neighboring cells, and they must ignore growth-inhibitory signals from other cells, resulting in uncontrolled growth and cell division
Indicate whether the statement is true or false
Which of the following processes plays an important role in the phosphorous cycle?
a. cell respiration b. evaporation c. erosion d. combustion e. transpiration
Stands of white spruce and balsam fir dominate North America’s ____
a. tropical montane forests b. temperate grasslands c. boreal forest d. temperate rainforest e. chaparral