Calcium ions serve as second messengers.

a. true
b. false


a. true

Biology & Microbiology

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Most causes of speciation are relatively slow, in that they may take many generations to see changes, with the exception of _____

A) polyploidy B) reinforcement C) colonization D) natural selection

Biology & Microbiology

People who are intoxicated cannot coordinate their movements or walk a straight line because alcohol disrupts the normal function of which region of the brain?

A) cerebellum B) cerebrum C) corpus callosum D) hypothalamus E) thalamus

Biology & Microbiology

The mammalian trachea and esophagus both connect to the _____

A) stomach B) pharynx C) rectum D) epiglottis

Biology & Microbiology

Which is a description of pharmacokinetics?

a. Type of ionizing radiation b. Study of the distribution and removal of drugs in the body c. method of giving x-ray treatment d. use of drugs to increase the sensitivity of tumors to x-rays e. abnormal growth of cells

Biology & Microbiology