A scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies
covalently linked to fluorescent dyes (antibodies to mouse proteins--green; antibodies to human
proteins--red). Forty minutes later, the researcher looked at the fused cell and observed ____.
a. the cell was still half red and half green.
b. the red and green fluorescent labels were uniformly distributed across the entire membrane
c. the red and green labels were distributed in intermingled patches
d. the red and green labels flashed intermittently
e. the red and green labels were distributed in a swirling pattern
B
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The method of contracting an illness after touching a contaminated doorknob, diaper or
handkerchief is a. direct contact. b. indirect contact. c. inhalation contact. d. contact with a vector. e. retro-contact.
As the two strands of DNA are unraveled, which enzyme relieves the strain on the two strands?
A. DNA endonuclease B. DNA polymerase C. DNA exonuclease D. DNA ligase E. DNA gyrase
The plant hormone that stimulates cell division in seeds and fruits is
A. auxin. B. jasmonic acid. C. abscisic acid. D. cytokinin. E. ethylene.
The anatomical structure identified with the
letters "B" and "E" in the figure above is a. the arterial wall. b. the lumen. c. atherosclerotic plaque. d. the capillary wall. e. none of these