For an animal to respond to a pheromone it must:a
have a specific receptor.
b. be able to see it coming.
c. be able to smell it with its nose.
d. have a thin epidermis or hair so it can penetrate.
e. be of the opposite sex of the individual from which it was produced.
A
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Which of the following white blood cells kills infected or cancerous body cells?
a. eosinophils b. B lymphocytes c. natural killer (NK) cells d. mast cells
Hensen's node is located:a
in the walls of the archenteron. b. at the end of the primitive streak. c. on the outer side of the chorion. d. inside a blastomere. e. inside the neural groove
Which of the following is NOT a true statement regarding the prothallus?
a. It produces eggs. b. It results from a spore that lands on moist soil and grows. c. It is the free-living haploid life stage of a fern. d. It produces sperm. e. It has a conical structure.
Bacterial drug resistance could be reduced by
A) physicians writing more prescriptions. B) washing hands more often with antibacterial soaps. C) more susceptibility testing. D) all of the above