The Euphorbia of desert parts of Africa and India are succulent and have thorns but are superficially very similar to the unrelated cacti native to the deserts of the Americas. This pair of plant groups represents an example of ________
A) apostatic selection B) convergent evolution
C) homology D) divergent evolution
Answer: B
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In an ECG, the electrode used in grounding is
a. LA b. LL c. RA d. RL e.VI.
An enzyme that attaches a phosphate group to another molecule is called a _______________
A. phosphatase B. phosphorylase C. kinase D. cyclase
Which medium can be described as suppressing the growth of most gram-negative organisms while allowing gram-positive bacteria to grow?
a. Chocolate b. CNA blood c. BHI d. Thioglycollate broth
Cell-mediated immunity is directed by:
a. B cells, which secrete antibodies. b. T cells, which secrete antibodies. c. macrophages, which produce histamines. d. B cells, which react with antigen-MHC complexes. e. T cells, which react with antigen-MHC complexes.