What do the two daughter cells generated by the first asymmetric division of the plant zygote become?
A. the suspensor and the embryo
B. the epicotyl and the hypocotyl
C. the root and the shoot
D. the egg and pollen
E. the xylem and the phloem
A. the suspensor and the embryo
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Our ability to respond to moderate heat and cold is due to
A. mechanoreceptors. B. thermoreceptors. C. nociceptors. D. electromagnetic receptors. E. chemoreceptors.
A bacterium is found that is resistant to the antibiotic gentamicin. The bacterium was isolated in a hospital where patients were routinely given gentamicin for a variety of infections. What was the pressure that selected for this resistant population?
A) presence of gentamicin in the environment B) high mutation rate for the bacterium C) growth situation for the bacterium D) patients that did not receive the antibiotic
Green plants are able to convert water and carbon dioxide into sugar and store it as _____.
Fill in the blank(s) with the appropriate word(s).
Researchers are developing a ribozyme that cleaves the HIV genome. This pharmaceutical agent could be described as
A) an RNA molecule capable of catalysis. B) a hydrolase. C) a genetic transposable element. D) a protease inhibitor. E) a competitive inhibitor for reverse transcriptase.