An atrioventricular valve would be located
a. between the left atrium and the left ventricle.
b. between the right atrium and the right ventricle.
c. where blood is entering the aorta.
d. where blood is entering the pulmonary arteries.
e. between the left atrium and the left ventricle, and between the right atrium and the right
ventricle.
E
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What will be an ideal response?
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.
By definition, a(n) endemic species is a species that is not found anywhere else in the world. Indicate whether the statement is true or false
Suppose sugar is taken out of an excretory system tubule and put back into the blood. What would this process be an example of?
a. secretion b. release c. filtration d. reabsorption