A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?
A. 5
B. 9
C. 0
D. 14
E. 7
Answer: A
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Studies have determined that all of the following except ______ are responsible for the cyclical rise
and fall of arctic hare and lynx populations.
a. predation b. a limited food supply for hares c. predation by other mammals d. intraspecies competition e. disease
In which animals would diffusion alone not be an effective transport mechanism for gas exchange?
a. nematodes b. sponges c. cnidarians d. annelids e. flatworms
Griscelli syndrome, a disease caused by mutations in the gene encoding Rab27a, is characterized by abnormal
a. transport of melanosomes. b. export of neurotransmitters. c. export of vesicles in T lymphocytes. d. Both a and c
The findings of Pasteur and others have established that
A) living organisms regularly self-assemble (arise spontaneously) from nonliving matter. B) living organisms do not arise from nonliving matter today, nor did they arise from nonlife in the past. C) advanced organisms cannot arise from nonliving matter, but simple microbial life often does arise from nonlife today. D) life does not arise from nonliving matter today, but in the conditions of early Earth, such an event could have occurred.