Alberto had a bad bump on his leg, so he went to see the doctor about it. The physician diagnosed it as a blood clot and said that blood clots can float away into the circulation. One of these floaters is called a(n) ________
A) prothrombin
B) formed element
C) platelet plug
D) embolus
D
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A mutualistic association between a plant root and a fungus is known as a
(a) sac fungus. (b) lichen. (c) mycorrhizal root. (d) club fungus.
The HIV virus contains all of the following components except ________
A) integrase B) double-stranded RNA C) single-stranded RNA D) reverse transcriptase E) protease
All of the statements below are true. Select the statement that best supports the view of most biologists that viruses are nonliving.
a) The viral genome may be single-stranded or double-stranded RNA or DNA. b) Viruses are obligate intracellular parasites. c) An isolated virus is unable to replicate its genes or regenerate ATP.
Autoimmune disorders are
A) chronic conditions that develop from the immune system attacking healthy self-tissues that should normally be left alone. B) genetic conditions present from birth that continually degrade over time. C) caused by the immune system not being stimulated enough in adolescence and as a result is over reactive and can cross-react with host tissues. D) acute infections that target the immune system. E) short-term mistakes made by the immune system that are quickly recognized and self-limited.