The tough "horny" superficial layer of the epidermis is known as the
A) stratum corneum.
B) stratum lucidum.
C) stratum basale.
D) stratum granulosum.
E) stratum spinosum.
Answer: A
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Which describes the action of a ligand's competitive antagonist?
A. It binds to a different binding site on the protein, altering the protein shape so that a ligand cannot bind. B. When present, it increases the binding of a ligand to its receptor. C. It decreases the amount of ligand required to activate the protein. D. It blocks the binding of the ligand to its binding site and prevents activation of the protein.
Cataract leads to blindness due to
a) loss of transparency of the lens. b) a high intraocular pressure. c) photophobia. d) scotoma. e) trachoma.
What part of the eye controls the amount of light entering through the pupil?
What will be an ideal response?
abnormally large or hypertrophied glands tend to produce low hormone levels
a. true b. false