RNAProtein160-page3

RNAProtein160-page3 - complementary base pair bonds. The...

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Gene Expression – DNA to Protein - 3 Structure of RNA Molecules There are three main types of RNA: messenger RNA (mRNA), transfer RNA (tRNA) and ribosomal RNA (rRNA). All are synthesized in the nucleus by the process of transcription. RNA is composed of: Phosphate Ribose sugar Four nucleotides Adenine Guanine Cytosine Uracil Replaces the thymine found in DNA. Uracil bonds to Adenine Molecules of RNA are single-stranded, not double-stranded as in DNA. However, some RNA molecules fold back on themselves at places, called hairpins, forming
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Unformatted text preview: complementary base pair bonds. The Types of RNA 1 . Messenger RNA (mRNA) • mRNA is the unique blueprint, or transcript for each protein to be assembled. • mRNA is manufactured by transcription on demand; that is when a specific protein is needed in the cell. • mRNA molecules are a precise sequence of nucleotides that complement the DNA template strand. • A specific mRNA migrates from the nucleus to ribosomes for the process of translation. Diagram of mRNA base sequence...
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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