Which of the following is NOT a characteristic of protozoa?
A. most exhibit asexual reproduction.
B. they are single-celled organisms.
C. they are eukaryotic organisms.
D. they are all photosynthetic.
E. they frequently possess cilia or flagella.
Answer: D
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The observation that different geographical areas sometimes exhibit plant and animal communities of similar appearance, even though the individual plants and animals are not closely related, is called
A. the fossil record. B. homology. C. convergent evolution. D. divergent evolution. E. adaptation.
In the optochin susceptibility testif there is a zone of inhibition of 19-30mm surrounding the disk following overnight incubation at 37 degrees celcius the colony most likely consists of
A. Staphylococci B. Intestinal bacilli C. Pneumococci D. Enterococci
The general sequence by which a plant responds to external stimuli is
A. input-reflex-output. B. leaf-stem-root. C. reception-transduction-cellular response. D. sensory nerve-interneuron-motor nerve. E. chloroplast-vascular bundle-sap.
If red blood cells cultured in an isotonic medium are placed in distilled water, they will most likely:
A. become dormant B. shrivel C. remain unchanged D. divide E. swell and lyse