Transposons may or may not leave a copy behind at the original site, whereas retrotransposons always leave a copy behind at the original site.
a. true
b. false
Answer: a. true
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What are the structures labeled “C” in the accompanying figure?
a. plasmodesmata b. basement membranes c. tight junctions d. gap junctions e. adhering junctions
What two types of spontaneous damage to individual nucleotides are associated with subsequent mutation?
What will be an ideal response?
Which of the following is a rocky, layered structure that forms over time as a mat of aquatic prokaryotic cells traps sediments?
A. Ozone layer B. Stromatolite C. Petroglyphs D. Stalactites E. Foraminifera
Which of the following is NOT an antimicrobial feature of the urinary system?
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