Why would a cancer cell need to induce angiogenesis?
A. It would activate oncogenes.
B. It would inactivate tumor suppressors.
C. Cells could then produce proteins that avoid checkpoints in the cell cycle.
D. It is another name for stage I in metastasis.
E. Cancer cells depend on a large blood supply.
E. Cancer cells depend on a large blood supply.
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Dr. Edward Jenner realized that cows have a disease called cowpox, which is like a disease that infects humans called smallpox; Jenner noticed that milkmaids whose hands were infected with cowpox were not contracting smallpox. Jenner infected a child with the pus from a cowpox blister, and found that the child did not contract smallpox. Which statement represents a supporting hypothesis?
A. The cowpox virus prevented the small pox virus from entering the child's immune system. B. the smallpox virus was so similar to the cowpox virus that the child's immune system ignored the smallpox virus C. The cowpox infection will prevent the child from being infected by the small pox virus. D. The cowpox infection will have no effect on the child's immunity to the small pox virus.
Which of the following describes primary succession?
a. succession on land that previously had no life b. succession that moves a community away from equilibrium c. succession in response to a natural disturbance d. succession characterized by equilibrium
Movement of a molecule against a concentration
gradient is a. simple diffusion. b. facilitated diffusion. c. osmosis. d. active transport. e. bulk flow.
A cytotoxic T cell (CTL) differs from a natural killer cell in that the CTL is _______ specific and _________ memory cells.
A. less/produces B. less/does not produce C. more/produces D. more/does not produce