The selective advantage linked to the high frequency of the cystic fibrosis allele in Caucasians is:
a. an increased resistance to falciparum malaria.
b. the prevention of excessive water loss associated with certain types of diarrhea.
c. production of an enzyme to break down cholera toxin.
d. increased mucous secretions for the removal of infectious cells.
e. an increased probability of Salmonella infection.
b
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____ describes the process by which molecules of a substance will move from regions of high concentration to regions of low concentration (until an equilibrium is reached)
Fill in the blank with the appropriate word.
The federal government, as well as several state governments, collects DNA samples from all individuals arrested – but not necessarily convicted – for serious crimes. Should this be allowed? Why or why not?
What will be an ideal response?
Nearly half of the 4,000 placental mammal species are:
a. rodents b. bats c. herbivores d. predators e. hoofed animals
Which of the following has no organelles, ribosomes, or cytoplasm?
A) A bacterium B) A cyanobacterium C) A plant D) A virus E) An alga