Select the proper order of the propagation of an electrical (depolarization) signal in the heart
a. AV node ?Purkinje fibers ?SA node
b. AV node ?SA node ?Purkinje fibers
c. Purkinje fibers ?AV node ?SA node
d. Purkinje fibers ?SA node ?AV node
e. SA node ?AV node ?Purkinje fibers
ANSWER: e
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If a tumor suppressor gene becomes mutated, which of the following is not true?
A. Genes that inhibit the cell cycle are not turned on. B. The cell cycle continues when it should not. C. Apoptosis is less likely to occur. D. Genes that encode enzymes that repair DNA are not turned on. E. A "gain-of function" mutation has occurred.
Describe the organization of the ?-globin gene in humans
What will be an ideal response?
The substrate(s) in the Eosin Methylene Blue Agar is (are)
A. Lactose B. Sucrose C. Glucose D. Lactose & Sucrose E. Glucose & Lactose
Use the terms provided below to fill in the blanks. Not all words or phrases will be used; each word or phrase may be used more than once
Photons from sunlight that are in the ______________ wavelength range are preferentially absorbed by chlorophyll molecules to raise the energy levels of electrons in the __________ ring. The __________ reflected are lower in energy, which is indicated in the ________, green wavelengths detected by the human eye. benzene longer porphyrin blue orange red electrons photons shorter heme Fill in the blank(s) with correct word