The process in which nitrogenous waste products are decomposed by soil bacteria and fungi releasing NH3 or NH4 is
____.
a. nitrification
b. ammonification
c. denitrification
d. nitrogen fixation
e. hydrogenation
ANSWER: b
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Photosynthetic pigments of algae are found in cells within:
a. chloroplasts. b. nuclei. c. cell walls. d. mitochondria. e. vacuoles.
Species richness refers specifically to
a. the numbers of individuals of each species present. b. the ability of larger animals to enrich themselves by successfully preying on smaller ones. c. the number of different species in the habitat. d. the feeding levels at which the animals are located. e. none of these.
Which statement best describes how people die of carbon monoxide poisoning?
A) As the carbon dioxide content of blood increases, a phenomenon known as the Haldane effect converts the excess carbon dioxide to carbon monoxide until it reaches toxic levels. B) Carbon monoxide is toxic because it binds more readily to hemoglobin than oxygen, thereby decreasing the oxygen carrying capacity of blood. C) Carbon monoxide causes the carbamino effect where carbon dioxide is stripped of an oxygen, producing carbon monoxide. D) Carbon monoxide causes decompression sickness which can lead to death. E) Carbon monoxide is toxic because it readily picks up oxygen to produce carbon dioxide, causing acidosis and eventual death.
What is the function of the vertebral column?
A) Tear and crush food B) Provide weight in aquatic life-forms C) Protect the nerve cord D) Limit muscle attachments E) Help increase the metabolic rate