Why do electron microscopes have the ability resolve such small objects?
a. Because electrons have a much shorter wavelength than the photons of visiblelight
b. Because electrons have a much longer wavelength than the photons of visiblelight
a.
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Of the following, which is used to inhibit specific enzymes in the treatment of many bacterial and viral diseases?
A) substrate analogues B) noncompetitive inhibitors C) intercalating agents D) nitrous oxide E) X-rays
Which of the following illustrates viviparity?
a. A mare gives birth to a live colt b. A snake lays an egg right before it hatches c. A chicken lays an undeveloped egg d. A frog’s eggs are fertilized outside the body
Gap junctions in cells
a. prevent fluid leakage between adjacent cells. b. are used only to stimulate cellular reproduction. c. allow ions to pass between adjacent cells. d. only occur in muscle tissue. e. do none of these.
Electrical excitation for heart contraction originates in the ________ .
a. atrioventricular (AV) node b. Purkinje fibers c. intercalated disc d. sinoatrial (SA) node e. cardiac muscle cells