A bacterial genome is typically
A. a single linear piece of DNA.
B. multiple linear pieces of DNA.
C. a linear RNA molecule.
D. a single circular DNA molecule.
E. multiple circular DNA molecules.
Answer: D
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Lymphocyte maturation involves
A. B cells maturing in bone marrow sites. B. hormonal signals that initiate development. C. T cells maturing in the thymus. D. release of mature lymphocytes to begin migration to various lymphoid organs. E. All of the choices are correct.
Which factor is NOT characteristic of a city primarily plagued by photochemical smog?
a. high concentration of sulfur oxides b. high concentration of nitrogen oxides c. significant amounts of PANs d. large numbers of internal combustion engines e. occasional thermal inversions
What is the major structural difference between starch and glycogen?
A) the types of monosaccharide subunits in the molecules B) the type of glycosidic linkages in the molecule C) whether glucose is in the ? or ? form D) the amount of branching that occurs in the molecule
Which of the following antimicrobials does not match its potential shortcomings?
A) Macrolides: This narrow-spectrum drug must be administered parenterally. B) Phenicols: Has a narrow therapeutic index and is associated with bone marrow toxicity that results in aplastic anemia. C) Tetracyclines: Induce photosensitivity, causes detrimental effects on bones and teeth in children younger than 8 years old, and are associated with an increased risk of Clostridium difficile infection D) Aminoglycosides: Are known to cause irreversible hearing loss when administered other than topically. E) Lincosoamides: One common lincosoamide is associated with pseudomembranous colitis caused by Clostridium difficile.