A drop to pH 4.0 in the duodenum would primarily stimulate the release of ________.
A. gastrin
B. insulin
C. secretin
D. pepsin
E. cholecystokinin
Answer: C
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Immunity results from the actions of cells that circulate throughout the body, primarily through the blood and lymph
Indicate whether the statement is true or false.
About one in three people will be diagnosed with cancer at some time in his/her life
a. True b. False Indicate whether the statement is true or false
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.
All of the following are functions of the cell membrane EXCEPT:a
transmitting signals. b. participating in energy transfer. c. being freely permeable to all substances. d. regulating the passage of materials. e. participating in chemical reactions.