What portion of penicillins is responsible for differences in each compound's microbicidal activity?
A) The peptidoglycan
B) The thiazolidine ring
C) The beta-lactam ring
D) The variable side chain
Ans: D) The variable side chain
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The origin of a skeletal muscle is
(a) attached to the less mobile portion of the skeleton. (b) attached to the portion of the skeleton that moves when the muscle contracts. (c) never attached to the skeleton. (d) its belly.
Batrachochytrium dendrobatidis is a chytrid fungus that:
A. forms dendritic patterns of wood decay B. is a major pollutant in sewage wastewater C. readily captures cyanobacteria to form a lichen D. causes declines in frog populations E. is a major cause of pneumonia in AIDS patients
Mycorrhizae are a symbiotic association of
A. bacteria and algae. B. bacteria and virus. C. fungi and virus. D. plant roots and fungi.
In recombinant DNA technology, plasmids may be used to:
A. introduce foreign DNA into bacteria B. cut DNA at a specific location C. introduce foreign DNA into human cells D. activate restriction enzymes