M

tRNA

figure 10-14

Each of the three major types of RNA differs in its structure. Messenger RNA (mRNA) is typically drawn as a relatively straight chain. Ribosomal RNA (rRNA) is shown as part of the structure of a ribosome. Transfer RNA's (tRNA) two-dimensional structure is typically shown with only three of its many nucleotides emphasized.

Word Roots and Origins transcription from the Latin scribere, meaning "to write," and trans, meaning "across"

figure 10-15

During transcription, the enzyme RNA polymerase "reads" one of the chains, the template strand. RNA polymerase adds and then joins complementary RNA nucleotides, resulting in an RNA strand.

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