The fibrinolytic proteins of the blood are formed mainly by the
a) kidneys
b) lungs
c) bones
d) liver
e) pancreas
Answer: d) liver
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A five-carbon sugar connected to a purine or pyrimidine ring is most accurately referred to as a(n) ____
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Which of the following steps occurs third during yeast Ty element transposition?
A. packaging of RNA in a VLP along with reverse transcriptase, a protease, and integrase B. transport of Ty RNA into the cytoplasm where it is translated into VLP proteins C. transcription of Ty element in the nucleus D. "infection" of nucleus with VLP E. Conversion of mRNA into double-stranded DNA with reverse transcriptase
Should a genetic abnormality arise, ________ prevent a cell from progressing uncontrollably through the cell cycle.
A. cis-acting elements B. checkpoint proteins C. trans-acting elements D. growth factors E. Ras's
Which type of microscope provides the greatest depth of field?
a. light b. scanning electron c. transmission electron