All of the following are phenols or phenolics, except
A. hexachlorophene.
B. triclosan.
C. chloramines.
D. lysol.
E. cresols.
Answer: C
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Which of the following with regard to cancer cells is false ?
A) Growth is not regulated by growth factors. B) The cell cycle is disrupted. C) Most cancer cells die in G1 phase. D) Growth is not stopped by high levels of DNA damage. E) The apoptosis pathway is blocked.
In vertebrates, the neurotransmitter acetylcholine ____
a. can act as a direct neurotransmitter between neurons and muscle cells b. is involved in memory and learning c. can be released into the circulation and act as a hormone d. can act as a pain reducer and initiate euphoria e. is involved in pain perception
Even though nature has been carrying out genetic
experiments for 3.8 billion years, what may be the unsettling aspect of biologists’ foray into this endeavor is a. that humans are now “playing god.” b. uncertainty about our ability to evaluate the impact c. that scientists really do not know what they are doing in this area. d. the number of dangerous plants and animals that have been produced. e. the new diseases that could be created.
Approximately what percentage of prokaryotes are thought to be pathogens?
A) <1% B) 12% C) 26% D) 48%