RNA molecules are usually found as

a. a two-stranded double helix.
b. a single strand with some folds and twists where the strand bonds with itself to make some
double-helical regions.
c. part of a pair with a single DNA strand.
d. a single strand that has no double-helical regions.
e. an extra strand joined to a DNA double helix.


B

Biology & Microbiology

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