What is the advantage to the sphinx moth Xanthopan morgani by having an 8-inch-long tongue?
A. It can be used to capture other flying insects for food.
B. It is used to attract mates through sexual selection.
C. It can reach nectar that no other pollinator can reach.
D. It can only pollinate one type of flower.
E. It makes flying more efficient.
C. It can reach nectar that no other pollinator can reach.
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A diagnosis of tuberculosis involves a/an ________.
A. tuberculin skin test B. sputum culture C. chest X ray D. acid-fast stain of sputum E. All of the choices are correct.
Angiosperms use which temporary reproductive structures that are not present in any other group of plants?
A. flowers B. seeds C. receptacles D. carpels E. cones
Which may be a consequence of low secretion of parathyroid hormone?
A) convulsive contractions of skeletal muscles B) gigantism C) exhaustion of the immune system D) loss of calcium from the bone
In Figure 8.3, if enzyme A is an inducible enzyme,
A) compound C would bind to the repressor. B) compound A would bind to the repressor. C) compound B would bind to enzyme A. D) compound A would react with enzyme B. E) compound C would react with gene a.