A dance that recruits other bees into foraging
directly toward the sun is indicated by
a. A.
b. B.
c. C.
d. D.
e. E.
E
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The antibiotic rifamycin is selectively toxic in blocking protein synthesis in Mycobacterium tuberculosis because
A. the antibiotic binds to the mRNA once synthesized, preventing it from participating in the initiation complex with the ribosome. B. it binds preferentially to bacterial RNA polymerase rather than the eukaryotic protein, effectively halting transcription in the pathogen but not the host. C. bacterial ribosomes are 70s whereas host ribosome are 80s, thus the antibiotic binds to the M. tuberculosis ribosome but does not bind to the eukaryotic machinery. D. the drug binds to the initiator tRNA, preventing the formation of the protein synthesis initiation complex in the bacterial cell.
In a double helix, a ________ always pairs with a ________.
a. purine; pyrimidine b. carbon; phosphate c. purine; phosphate d. pyrimidine; carbon
Aerobic respiration became established as a result of the evolution of ____
a. the first protocells b. the first true cells c. metabolism d. the nuclear envelope e. the oxygen-producing pathway of photosynthesis
The activation of the parasympathetic branch of the autonomic nervous system is associated with _____
A) resting and digesting B) release of epinephrine into the blood C) increased metabolic rate D) intensive aerobic exercise