Microorganisms that typically live on human sur¬faces, including the interior tubes and cavities of the digestive and respiratory tracts, are called ____________.
A. normal flora
B. acne
C. biofilm
D. commensal organisms
E. parasitic organisms
Answer: A
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Which of the following statements about species, as defined by the biological species concept, is (are) correct? I. Biological species are defined by reproductive isolation. II. Biological species are the model used for grouping extinct forms of life. III. All members of a species can potentially interbreed.
A) I and II B) I and III C) II and III D) I, II, and III
Which is the correct plural form of the word for the organisms studied in this exercise?
(a) alga. (b) algae. (c) algas. (d) algaes.
An organism's genotype is its genetic makeup. An organism's physical traits are its ___________.
Fill in the blank(s) with the appropriate word(s).
A region of the nephron that regulates the blood pressure in the afferent arteriole, which stimulates the release of aldosterone, is the ________
A) juxtaglomerular apparatus B) glomerulus C) glomerular capsule D) loop of the nephron