The paramecium discussed in class contained an organelle called the contractile vacuole. This is the presumed precursor of the:
A. Heart
B. Kidney
C. Liver
D. Mouth
E. Answer not on this list
Answer: B. Kidney
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Which of the following designations indicates a sex-linked trait?
A. XB B. A C. IA D. i E. a
The following statements regarding penicillin production and applications are true EXCEPT
A) Penicillin is a secondary metabolite produced by a filamentous fungus. B) Penicillin derivatives can be produced by biosynthetic or semisynthetic methods. C) Natural penicillin (penicillin G) inhibits a wide spectrum of bacteria. D) Penicillin selection method is used to enrich the auxotrophic mutations. E) -lactamases, which cause penicillin resistance, are easily transferable when they are located on plasmids.
The recent appearance of antibiotic-resistant strains of bacteria is an example of
A) the action of memory cells. B) evolution by natural selection. C) natural immunity. D) inflammation.
A water-vascular system is characteristic of the phylum ____.
A. Nematoda B. Annelida C. Chordata D. Mollusca E. Echinodermata