Anaphylactic shock
A. occurs when the allergen has entered the bloodstream.
B. is an immediate allergic reaction.
C. is characterized by a sudden and life-threatening drop in blood pressure.
D. All of these are true.
E. None of these are true.
Answer: D
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Typhoid fever has been virtually (although not completely) eliminated from developed countries
Indicate whether the statement is true or false.
During generalized transduction
A. the host chromosome is degraded into randomly sized fragments. B. any bacterial gene may be transferred to the subsequent host. C. any DNA fragment of the appropriate size is packaged. D. All of the choices are correct.
Which of the following does not increase the level of nutrients available to crop plants?
A. adding humus to the soil B. crop rotation C. plowing crop residues under D. applying herbicides E. applying chemical fertilizers
Genetic modification
A) alters genetic codes so that one species' code is like another's. B) adds sugars and phosphates in a nucleus. C) alters, deletes, or adds DNA to a cell. D) substitutes entire nuclei to genetically engineer a cell.