Question

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page 26 of 50
question 26
which of the following is not true of transposons?
a they are always part of plasmids.
b they can transfer drug resistance.
c they can replace damaged dna.
d they can change the genome.
e they can change pigmentation.

Explanation:

Transposons (jumping genes) are mobile genetic elements. They can exist in chromosomes or plasmids, not always plasmids (so A is false). They transfer drug resistance (B true), insert into DNA but don’t replace damaged DNA (C false? Wait, correction: Transposons move, not repair. Key point: Option A claims "always part of plasmids"—transposons are in chromosomes too, so A is the incorrect statement. B is true (carry resistance genes), C: no evidence they replace damaged DNA? Wait no, standard fact: Transposons are not always on plasmids. So A is the false statement.

Answer:

A. They are always part of plasmids.