The scientist responsible for the development of the first anti-plague vaccine in 1866 was

A. Alexandre Yersin.
B. Robert Koch.
C. Louis Pasteur.
D. Josef Marburg.


A.

Biology & Microbiology

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What structure separates the inner and outer layers that form sponges?

a. spicules b. choanocyte c. osculum d. mesohyl

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Disruption of neural signaling can produce profound changes in mood and behavior. Cocaine exerts its effects by

A. blocking serotonin reuptake from synapses. B. blocking the enzyme acetylcholinesterase. C. binding to the GABA receptor to enhance inhibitory neurotransmission. D. preventing neurotransmitter vesicle fusion with presynaptic neuron membranes. E. blocking norepinephrine and dopamine reuptake from synapses.

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Hagfishes lack jaws

Indicate whether the statement is true or false

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Which of the following is a function of the human urinary system?

A) detoxification of waste products B) elimination of undigested foods C) regulation of water content for body fluids D) production of ammonia

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