A 20-year-old man is injured in a motorcycle accident. His ulna was broken and protruding from the skin. His injury is
classified as a ____.
a. simple fracture
b. complete fracture
c. dislocation fracture
d. compound fracture
e. synovial fracture
ANSWER: d
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Which of the following assembles a short RNA chain as the first nucleotides in a new DNA strand?
a. topoisomerase b. primase c. DNA polymerase d. helicase e. DNA ligase
Filtrate from Bowman's capsule flows into the
a. papillary duct. b. loop of Henle. c. proximal tubule. d. distal tubules. e. peritubular capillary.
In Leber's disease (LHON), degeneration of the optic nerve results in blindness due to a defect in NADH dehydrogenase affecting electron transport
If this is due to a mutation in a mitochondrial gene, which combination of the following effects would you expect to see when doing a pedigree analysis of a family with LHON? i. variable expressivity ii. incomplete penetrance iii. progressive blindness over time iv. maternal inheritance v. diminished muscle mass A) i and ii only B) ii and iii only C) iii and iv only D) i, ii, iii, and v only E) i, ii, iii, and iv only
The nearest living relatives of crocodiles and alligators are
A. birds. B. lizards. C. snakes. D. turtles. E. manatees.