A physician is listening to a patient’s heart and notices an abnormal “dup” sound on the left side. This indicates a potential problem with the ____.

a. mitral valve
b. bicuspid valve
c. tricuspid
d. pulmonary vein
e. aortic semilunar valve


ANSWER: e

Biology & Microbiology

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In addition to chromosomes, some mitochondria also contain other genetic material known as

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Using protein gel electrophoresis to measure genetic variation in populations has some drawbacks. Which of the following is/are problems with the technique? Select all correct

What will be an ideal response?

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Balanced polymorphism in a population is likely the result of

a. disruptive selection. b. sexual selection. c. directional selection. d. reproductive isolation. e. stabilizing selection.

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When the trunk or limb of a tree provides the substrate on which an epiphytic orchid grows, the arrangement benefits the orchid, which gets nutrients from the air and moisture from aerial roots, while the tree is unaffected

The relationship is referred to as A) amensalism. B) commensalism. C) competition. D) parasitoidism.

Biology & Microbiology