Norwalk agent is
A. a common enteric virus of gastroenteritis.
B. transmitted orofecally.
C. a calicivirus.
D. sometimes acquired from contaminated water and shellfish.
E. All of the choices are correct.
Answer: E
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Discuss how recent advances in the molecular biology of nucleic acids have revolutionized methods used for the identification of infectious disease agents and how they are favored over traditional biochemical tests
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We study cellular respiration because it is one of the most important pathways in biology. In fact,
nearly all carbohydrates at some point in their catabolism are directed through cellular respiration. Why is it NOT necessary to have multiple independent pathways to break down different molecules?
a. Using cellular respiration is theoretically the most efficient way to break down sugars and other molecules. b. Oxygen must be used in the breakdown of all molecules in order to yield ATP. c. Greater complexity would lead to an eventual failure of the biological system. d. Most biological cells only catabolize one or two different types of sugars and only need one main pathway. e. The molecules that are degraded are all structurally similar and relatively easily interconverted.
Which of the following is a correct sequence of cells in oogenesis?
a. oogonium ? primary oocyte ? secondary oocyte b. oogonium ? secondary oocyte ? primary oocyte c. primary oocyte ? secondary oocyte ? oogonium d. primary oocyte ? oogonium ? secondary oocyte e. secondary oocyte ? primary oocyte??oogonium
When activated, trigger(s) a chain reaction that puncture(s) bacterial cell membranes.
A. histamine B. interleukin C. ADH D. complement proteins E. epinephrine