Which of the following might cause sensorineural deafness?
A) rotating the head to relax neck muscles B) fusion of the auditory ossicles
C) listening to very loud music on a daily basis D) excess earwax in the external auditory canal
Ans: A) rotating the head to relax neck muscles
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A mutation can cause disease if
A. the DNA sequence changes so that one amino acid is substituted for another in a way that affects the encoded protein's functioning. B. it attracts mutagens. C. the DNA sequence does not change. D. the DNA sequence changes so that one amino acid is substituted for another in a way that does not alter the encoded protein's functioning.
Exposure to ultraviolet light causes the skin to darken by stimulating the
A. breakdown of carotene. B. breakdown of melanin. C. activity of the keratinocytes. D. activity of the enzyme tyrosinase. E. buildup of bilirubin.
The pelvic girdle meets the axial skeleton where the
A) appendicular skeleton and the axial skeleton do not touch. B) sacrum attaches to the fifth lumbar vertebra. C) ilium attaches to the sacrum. D) femur attaches to the tibia. E) acetabulum attaches to the head of the femur.
The MOST disastrous consequence of a severe traumatic brain injury is:
A) an increase in intracranial pressure. B) an increase in mean arterial pressure. C) severe hypertension and bradycardia. D) a decrease in cerebral perfusion pressure.