Which of the following is a consequence of breathing secondhand smoke?
A) Nonsmoking children of smokers are more likely to contract pneumonia.
B) Nonsmoking children of smokers are less likely to develop atherosclerosis.
C) Smokers are more likely to have increased lung capacity.
D) Nonsmoking spouses of smokers have a 30% lower risk of heart attack.
A
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Immediately after an action potential passes along an axon, it is not possible to generate a second action potential. Thus, we state that the membrane is briefly _____
A) hyperexcitable B) refractory C) fully depolarized D) above threshold E) at the equilibrium potential
Most of the organisms that normally inhabit our skin help defend us against infection
a. True b. False
How do autopolyploidy and allopolyploidy differ?
A. Only autopolyploidy involves an increase in chromosome sets. B. The chromosomes of an autopolyploid individual come from the same species, while an allopolyploid individual has sets of chromosomes from different species. C. Autopolyploidy is a mechanism of speciation in plants, while allopolyploidy is a mechanism of speciation in animals. D. Autopolyploidy is sympatric, while allopolyploidy is allopatric.
Many plants produce chemicals that are used as medicines. For example, the drug digitalis, which stimulates the human heart, is derived from foxglove, a poisonous plant. What advantage does producing toxic compounds have for the plant?
What will be an ideal response?