Salinity is higher in an estuary than in the ocean
Indicate whether the statement is true or false
FALSE
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In mammalian defenses against invading pathogens, all of these are considered nonspecific defense mechanisms EXCEPT
A. acquired immunity. B. the skin. C. mucous membranes. D. the inflammatory response. E. antimicrobial proteins (e.g., interferon).
One reason that malaria continues to be the world's most significant infectious disease is because Plasmodium falciparum continues to develop resistance to the drugs that have been used to treat malaria. Which of the following is the contributing factor to its resistance?
A. The antimalarial drugs cause mutations to occur in the mosquito. B. Some Plasmodium falciparum have preexisting mutations that make them resistant to antimalarial drugs. C. Some mosquitoes have preexisting mutations that make them resistant to antimalarial drugs. D. The antimalarial drugs cause mutations to occur in Plasmodium falciparum. E. Some people have preexisting mutations that make them resistant to antimalarial drugs.
After a muscle cell contracts, which of the following must occur for the muscle to stop contracting?
A. Calcium ions must be pumped back into the endoplasmic reticulum. B. Calcium ions must flow out of the endoplasmic reticulum. C. Calcium ions must flow into the muscle cell. D. Calcium ions must flow out of the muscle cell. E. Calcium ions must be pumped out of the muscle cell.
Which term denotes the conditions, resources, and interactions necessary for survival and reproduction of a species?
a. habitat b. niche c. carrying capacity d. community e. ecosystem