Which of the following is correct regarding enzymes?
A) They are made of lipids.
B) They slow down cellular reactions.
C) They are organic catalysts and are made of proteins.
D) They bind to the active site of substrates.
E) They are released during cellular injury.
Answer: C
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What structure is immediately anterior to the palatine tonsil?
a. uvula b. palatoglossal arch c. palatopharyngeal arch d. epiglottis
The pitch of the sound produced by the vocal folds is controlled by the
A. frequency of the vibrations. B. amplitude of the vibrations. C. thickness of the thyroid cartilage. D. size of the glottis. E. force of air moving past them.
Vasoconstriction
a. causes a decrease in resistance. b. occurs when there is a decrease in the radius of a vessel. c. due to a decrease in sympathetic activity. d. two of these answers. e. all of these answers.
Oral contraceptives may cause
A. breast tenderness. B. pregnancy, as they have a high (21 in 100 women) rate of failure. C. loss of bone density. D. intrauterine damage.