Which sentence best describes fluorescence?

a. A pigment molecule accepts a high-energy electron and releases a photon of energy.
b. A high-energy electron leaves its nucleus and moves to a different molecule.
c. A high-energy electron returns to its ground state by releasing energy in a photon.
d. A low-energy electron moves to a high-energy state by absorbing heat.


Answer: c. A high-energy electron returns to its ground state by releasing energy in a photon.

Biology & Microbiology

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The infectious dose for cholera is much larger than that for shigellosis

Indicate whether this statement is TRUE or FALSE.

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Which type of microscope creates an image by capturing electrons ejected from the specimen?

a. LM b. TEM c. SEM

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In a four-chambered heart, which of the

following would have the thickest muscle?

a. right atrium b. left atrium c. right ventricle d. left ventricle e. both ventricles would have equally thicker muscle than the atria

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Human infection with Erysipelothrix rhysiopathiae takes a milder form and is known as:

A. Erysipelas B. Erysipeloid C. Impetigo D. Necrotizing fasciitis

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