Nerve gas has its effect by causing the
accumulation of ___ in the synaptic cleft.
a. dopamine
b. serotonin
c. acetylcholine
d. epinephrin
e. an endorphin
C
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The tuberculin skin test looks to identify ________ specific to Mycobacterium tuberculosis
A) antibodies B) antigens C) delayed hypersensitive (DTH) TH1 cells D) delayed hypersensitive (DTH) TC cells
In humans and other mammals, X inactivation takes place:
A. early in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. B. late in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. C. throughout the lifetime of an organismâ€"with each new cell division, both X chromosomes are activated, and one is then inactivated in each new cell. D. early in development, with all maternal X chromosomes being inactivated and cells maintaining active copies of only the paternal X chromosome. E. early in development, with all paternal X chromosomes being inactivated and cells maintaining active copies of only the maternal X chromosome.
When cloning DNA into bacteria, the ____
a. DNA sequence is inserted into a plasmid b. DNA sequence is inserted into the bacterial chromosome c. linear DNA sequence is circularized, thus generating a plasmid d. new DNA is directly introduced into the bacterial cell e. approach depends on the species of host bacteria used in the experiment
Botulin, the toxin of botulism is
A. not as virulent as tetanospasmin. B. detected and diagnosed by analyzing a patient's blood. C. the cause of rigid paralysis. D. only produced under anaerobic conditions. E. produced when spores germinate in the intestines of adults after ingesting contaminated food.