If different populations of the same species become geographically isolated and evolve reproductive isolation over a period of time, then _______________ has occurred.
A. artificial selection
B. extinction
C. speciation
D. adaptation
E. classification
Ans: C. speciation
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Suppose you are culturing tobacco callus in a Petri dish at a 10:1 ratio of auxin to cytokinin. To promote only shoot
development you would ____.
a. increase the cytokinin ratio b. increase the auxin ratio c. reduce the auxin level significantly and increase the cytokinin level slightly d. grow the tobacco in the dark e. grow the tobacco in the light
The "lub" heart sound represents
a. a heart murmur. b. closure of the AV valves. c. closure of the SL valves. d. hypertension. e. movement of actual heart muscle.
Which system relies on the activity of both skeletal and smooth muscle?
a. skeletal b. sensory c. respiratory d. nervous e. endocrine
All of the following are involved in the generation of an allergic response EXCEPT which one?
A) allergen B) IgE C) IgG D) mast cells and basophils E) histamine