Two types of cholesterol are found in human blood, HDL and LDL. Clinical studies have shown that
the risk of coronary heart disease is greatest for a person with a ____ level of HDL in their blood and a
____ level of LDL in their blood.
a. high; low
b. low; low
c. low; high
d. low; moderate
e. moderate; moderate
C
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Most organisms are dependent upon plants
because
a. plants produce oxygen as a by-product of photosynthesis. b. as producers, they form the base of food chains. c. they function to prevent erosion and reduce desertification. d. as they remove carbon dioxide from the atmosphere, they reduce the problems generated by the greenhouse effect. e. all of these apply
Which of the following is NOT involved in the formation of a blood clot?
a. plasma cells b. fibrinogen c. thrombin d. fibrin e. factor X.
Among mammals, the home range is usually larger for
A) carnivorous species than for herbivorous species of the same body size. B) females than males of the same species. C) immatures than for adults of the same species. D) smaller species than for larger species.
Single-celled fungi that parasitize animal cells are called
a. zygomycota b. connidiomycota c. ascomycota d. AM fungi e. microsporidia