During cell division the progeny of a trypanosome express a different VSG gene than their parents. Why is this done?
A. To hide from the host's immune system.
B. VSG genes inhibit phagocytosis.
C. VSG genes activate photoheterotrophy.
D. To signal endocytosis of the parasites.
Answer: A
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Cell division in the apical meristems at the tips of a plant that results in increases in height or length is called
A. primary growth. B. secondary growth. C. vascular cambium growth. D. mitotic growth. E. herbaceous growth.
Explain an impact of human development on the water cycle
What will be an ideal response?
At what level of organization does life begin?
a. digestive system b. cell c. molecule (water) d. molecule (DNA) e. population
The person credited with being the co-discoverer of
evolution by natural selection was a. Alfred Wallace. b. Charles Lyell. c. Thomas Malthus. d. James Hutton. e. John Henslow.