The greatest concentration of nitrogen on earth
is found in
a. living organisms, including bacteria.
b. the atmosphere.
c. soil minerals.
d. fossil fuels.
e. oceans.
B
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Which explanation is NOT a reason for why Hawaiian honeycreepers are vulnerable to extinction
a. reduction of their habitats b. frequent volcanic eruptions c. encroachment of humans into their habitats d. importation of new predators and competitors into their habitats e. warming of their habitats, supporting mosquitoes that carry avian malaria pathogens
A circular DNA molecule with two restriction enzyme cut sites will yield three fragments on digestion
Indicate whether the statement is true or false
In cases of acute appendicitis, if the appendix is intact when it is removed only a single dose of antibiotic given at the time of surgery is necessary
Indicate whether the statement is true or false
Which of the following is true of zinc?
a. It binds to most proteins in the body. b. Grains are the most reliable food sources of zinc. c. Excess zinc can decrease copper absorption. d. All of its functions involve it acting as a co-factor for enzymes.