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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology