Bone protrudes through the skin in a fracture called ________.
A. open
B. closed
C. incomplete
D. displaced
E. complete
Answer: A
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Which of the following can cause demyelination?
A) arsenic poisoning B) diphtheria C) multiple sclerosis D) mercury exposure E) Demyelination can be caused by arsenic, diphtheria, multiple sclerosis and mercury.
What is the result of alternative splicing of mRNA?
A) A new gene is produced. B) Proteins isomerize. C) Isoenzymes are produced from a single gene. D) The DNA is replicated. E) Genes are mutated.
The type of intercellular junction that consists of fused membranes is a(an)
A) ion channel. B) gap junction. C) desmosome. D) tight junction.
To initiate a cardiac muscle cell contraction, calcium
A. binds to actin. B. binds to troponin. C. binds to calmodulin. D. binds to the Z-disc. E. binds to tropomyosin.