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

Biology & Microbiology

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Which of the following designations indicates a sex-linked trait?

A. XB B. A C. IA D. i E. a

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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.

Biology & Microbiology

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.

Biology & Microbiology

A water-vascular system is characteristic of the phylum ____.

A. Nematoda B. Annelida C. Chordata D. Mollusca E. Echinodermata

Biology & Microbiology