________, a viral enzyme, is used to convert single-stranded RNA into ___________ for cloning. Fill in the blank(s) with the appropriate word(s)
ANSWER: Reverse transcriptase; cDNA
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Which of the following is NOT true about how communities of cells interact within tissues?
A. All cells in a tissue carry out the same function independently. B. Cells communicate with neighboring cells and their environment. C. Cells stick together to function together in a tissue. D. Cells carry out specialized functions within a multicellular organism. E. All cells require energy to function.
A disruption of the stomach's protective mucus layer might give rise to ____
a. acid reflux b. ulcers c. peristalsis d. heart burn e. choking
What makes phospholipid membranes good at keeping some molecules out, and allowing others to freely pass?
a. They are positively charged. b. They are completely hydrophobic. c. They are completely hydrophilic. d. They have both hydrophilic and hydrophobic regions.
DNA moves in electrophoresis because of the influence of a(n) ___ ___.
What will be an ideal response?