Net primary productivity in an ecosystem increases as mean annual temperature
A) and mean annual rainfall decrease.
B) decreases and mean annual rainfall increases.
C) increases and mean annual rainfall decreases.
D) and mean annual rainfall increases.
D
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The lungs are protected from microorganisms by
A. the mucociliary blanket. B. phagocytic action of alveolar macrophages. C. lysozyme in mucus. D. All of the choices are correct.
The following experiment is hypothetical. Meselson and Stahl labeled DNA with the heavy N15 isotope of nitrogen, then allowed the DNA to go through one round of replication in the presence of the light N14 isotope. After analyzing the resulting double stranded DNA helices in a CsCl density gradient they observed two bands of DNA in the gradient. One band was found in a position expected for DNA that had only the light N14 isotope, while the other band was found at the heavy N15 position. These observations are consistent with which mode of DNA replication?
a. dispersive replication b. conservative replication c. dispersive or semi-conservative replication d. semi-conservative replication
Quaternary ammonium compounds ("quats") are used for
A) antisepsis. B) disinfection. C) sterilization. D) quantifying antimicrobial activity. E) both antisepsis and disinfection.
Which level of biological organization is composed of tissues?
(a). organism (b). organ system (c). organ (d). cell (e). molecules