Which microscope is especially useful in studying the surface structures of intact cells and viruses?
a) Transmission electron microscope
b) Scanning electron microscope
c) Phase-contrast microscope
d) Darkfield microscope
Ans: b) Scanning electron microscope
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A drug called Coumadin interferes with the action of vitamin K in the liver. What effect will Coumadin have on blood-clotting mechanisms?
A) Coumadin will make it necessary for the patient to eat extra leafy green vegetables. B) Vitamin K will not be absorbed from the digestive tract. C) The liver will not be able to produce needed clotting factors. D) Nothing, because vitamin K is not necessary for blood clotting.
Y-linked traits are
A. known as hemizygous traits. B. known to skip alternate generations of males. C. carried only by males and transmitted only to males. D. known to skip alternate generations of males and are carried only by males and transmitted only to males. E. known as hemizygous traits and are carried only by males and transmitted only to males.
Which of the following is responsible for the perception of smell?
A) Olfactory receptors B) Ganglion cells C) Corpuscles D) Olfactory bulb E) Optic nerve
Why does genetic imprinting inhibit parthenogenesis?
What will be an ideal response?