An insect that exhibits resistance to a pesticide
a. developed the resistance in response to the
pesticide.
b. mutated when exposed to the pesticide.
c. inherited genes that made it resistant to the
pesticide.
d. provides an example of pest resurgence.
e. is none of these.
Answer: c
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Why are vasodilation and vasoconstriction the main mechanisms to change blood flow?
A. Blood vessel length is relatively fixed and has no effect on blood flow. B. Blood hematocrit has no effect on blood flow. C. Leakage of fluids from the capillaries has no effect on blood flow. D. Sympathetic activation has no effect on blood flow.
In a food web diagram, ________ species feed on no other species but are fed upon by others
Fill in the blank(s) with correct word
The distinctive fur pattern of Siamese cats results when genes that are responsible for the coat color are influenced by
A) age. B) X-inactivation. C) gender. D) temperature. E) other genes.
Which of the following is a nonspecific cellular and vascular reaction to any tissue trauma?
a. Physical or surface barriers b. Immune response c. Inflammation d. Normal flora