Specimens are prepared for ________ microscopy using electron-dense stains.
A. atomic probe
B. bright-field
C. confocal
D. transmission electron
E. scanning tunneling
Answer: D
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In the accompanying figure, which structure is a rod of stiffened support tissue?
a. A b. B c. C d. D e. E
A deterioration in the myelin sheaths of motor axons to the lower leg would be expected to
a. remove the restraints to ion movement and speed up impulse transmission. b. cause immobility of the leg due to cessation of impulses to leg muscles. c. slow the rate of transmission and cause lack of motor control. d. have little effect because the sheaths are for insulation only. e. cause paralysis.
Summarize the experiment by Darwin that provided the first evidence for auxins
What will be an ideal response?
Circulatory systems have the primary benefit of overcoming the shortcomings of
A) temperature differences between the lungs and the active tissue. B) the slow rate at which diffusion occurs across cells. C) communication systems involving only the nervous system. D) having to cushion animals from trauma. E) fetal organisms maintaining an optimal body temperature.