How do the constituents of liquid medium differ from solid, gel-like medium?
a. Liquid medium contains agar, a polysaccharide extracted from algae.
b. Solid medium contains agar, a polysaccharide extracted from algae.
c. Solid medium contains agar, a complex lipid extracted from bacterial membranes.
d. Liquid medium contains more salts, which lower the freezing point.
e. Solid medium contains more fatty acids, which raise the melting point.
ANSWER: b
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Which of the following is not true about the cut-and-paste pathway of transposition?
A. The reaction forms covalent intermediates as did recombinases of site-specific recombination. B. At the target site, the insertion sites on each strand are staggered to create short repeated sequences at each end of the inserted transposon. C. Cut-and-paste transposition leaves double-stranded breaks at the donor site that can be repaired by recombination repair. D. The transposases molecules bound to either end of the transposon come together before cutting at the 3' ends of the transposon. E. The 3' ends generated by transposase now attack the 5' ends of the transposon, forming hairpins at the ends of the transposon as it is released from the DNA.
Inflammation begins when mast cells in tissue release __________, which increases blood flow and also makes
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