Duchenne muscular dystrophy and Becker's muscular dystrophy are caused by different mutations in the same X-linked
gene.
a. True
b. False
True
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The reverse transcription of HIV RNA utilizes host cell tRNA as a primer. Specifically, a tRNA for lysine is utilized. Would a drug that blocked the host cell synthesis of the tRNA for lysine be a good drug to prevent the HIV life cycle?
A. Yes, it should stop the reverse transcription of the HIV genome with few side effects. B. No, the virus would just use a different tRNA for priming. C. No, this would likely kill the cells that were drug treated, because they couldn't appropriately incorporate lysine into their proteins D. No, the priming function of the tRNA is not essential for the HIV life cycle.
Some studies suggest that, as global warming progresses, tropical lowland trees may be limited in their ability to move
northward because of ____.
a. predicted desertification of temperate areas b. temperatures in the north still being too low c. flooding of coastal areas d. extreme weather events like hurricanes and blizzards e. development and habitat loss
A person with two X chromosomes is the homogametic sex
Indicate whether the statement is true or false
A C4 plant is different from a C3 plant because a C4 plant:
A) stores CO2 in four-carbon molecules before the CO2 enters the Calvin cycle. B) can leave its stomata open longer without ill effect. C) does not have bundle-sheath cells. D) performs photorespiration.