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Transposons: Shifting Segments of the Genome (Quiz 2)

How can transposons cause evolutionary changes? Transposons are segments of the genome that have the ability to both replicate themselves and to insert themselves elsewhere in the genome. The function of transposons is merely to replicate themselves. However they can potentially play an important role in evolution by copying and transferring other genetic material. There is evidence that transposons and their host genomes have co-evolved over long periods and that transposon activity may increase in response to environmental factors. The movement of transposons is a source that increases genetic variability. In particular, transposons contain regulatory genes that control transposon activity. It is thought that these regulatory genes may evolve to control other genes as well.

View the animation below, then complete the quiz to test your knowledge of the concept.






1Transposons are made of
A)segments of RNA
B)segments of DNA
C)antibody
D)protein



2A transposon can do all of the following except
A)move from a plasmid into the recipient cell genome
B)move from one site on the host genome to another site on the host genome
C)move from a host genome to a plasmid
D)make a copy of itself, leaving the copy in the original position as it moves
E)lyse the host chromosome to which it is transferred



3When a transposon moves within a host cell, it
A)undergoes transformation
B)always removes all traces of itself from the original location
C)sometimes leaves a copy of itself at the original location
D)changes its DNA in the process



4A transposon enters a cell on a plasmid.
A)True
B)False



5A transposon can move from a host cell to a plasmid.
A)True
B)False







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