Drones are male honeybees that
A) build the hexagonal cells of wax for the larvae. B) mate with the queens.
C) forage for food. D) feed the developing larvae.
B
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In the tuberculin skin test, what would be the most likely reason why a positive test would NOT necessarily indicate an infection in progress in a patient who was born and grew up in the United States?
A. False-positives occur all the time. This might simply be an example of that. B. The TB skin test is a measure of reactivation of memory T cells. The memory T cells would be formed either during an active infection or would be remnants of a prior infection that may be cleared. Since the memory of the response persists, the test still shows positive, even though the patient is cleared of actual infection. C. Each person in the United States receives the BCG tuberculosis vaccine. This is an attenuated mycobacterium vaccine. The response to this vaccine makes us positive for the TB skin test, even though we may not have actually had a TB infection at any point in our lives. D. A positive TB skin test ALWAYS indicates a current, active infection.
A(n) ____________________ cannot be verified because it involves subjective judgment. Fill in the blank(s) with the appropriate word(s)
An embryo was exposed to a chemical early in its development. At birth, there is chromosomal damage to the skin linked to the chemical exposure. What other organ system should be examined for the same type of damage?
What will be an ideal response?
The bacterial genome often consists of a single chromosome that carries all of the essential genes and one or more varieties of plasmid that generally carry non-essential genes.
a. true b. false