Which of the following is an example of an
interacting effect causing a decline in a species?
a. habitat loss of the polar bear
b. dodo birds being hunted by sailors
c. pollution buildup in the eggs of eagles
d. decline in buffalo causing a drop in native clover
e. all of these
Answer: d
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The reintroduction of wolves in the year 1995 increased biodiversity in Yellowstone National Park by suppressing elk and coyote populations, allowing revegetation of stream and river banks.
a. The United States b. Russia c. The United Kingdom d. Canada
Roughly a quarter of all known species are currently threatened with extinction. What is the primary source of this threat?
What will be an ideal response?
Which of the following is NOT an action of interleukins released by phagocytic cells?
A) stimulation of the release of neutrophils from bone marrow B) increasing endothelial cell synthesis of adhesion molecules C) stimulating the production of acute phase proteins from the liver D) acting as opsonins to facilitate phagocytosis E) acting as endogenous pyrogens to increase body temperature
Which of the following is essential in PCR?
A) DNA polymerase B) antisense RNAs C) reverse transcriptase D) DNA primers E) both DNA primers and DNA polymerase