What happens to a protein that is exposed to acidic conditions?

A) It catalyzes.
B) It folds into a quarternary shape.
C) It denatures.
D) It reduces its pH.


Answer: C

Anatomy & Physiology

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The ectoderm forms which of the following?

A) muscle B) all lymphatic structures C) the cardiovascular system D) the thymus, thyroid gland, and pancreas E) all neural tissues

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Which is a true process when light strikes a visual pigment?

a. Bleaching occurs when the rhodopsin molecule breaks down into retinal and opsin. b. On absorbing light, retinal changes to a more circular shape. c. The location of the stimulated horizontal cells indicates the specific portion of the retina stimulated by the arriving photons. d. Opsin activation changes the permeability of the outer segment to potassium.

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What converts pepsinogen to pepsin?

A. Hydrochloric acid B. Intrinsic factor C. Gastric lipase D. Gastrin

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