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Published byKristopher Greer Modified over 8 years ago
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8.4 Transcription KEY CONCEPT Transcription converts a gene into a single-stranded RNA molecule.
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8.4 Transcription The central dogma includes three processes. RNA is a link between DNA and proteins. replication transcription translation – Replication – Transcription – Translation
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8.4 Transcription RNA differs from DNA in three major ways. –RNA has a ribose sugar. –RNA has uracil instead of thymine. –RNA is a single-stranded structure.
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8.4 Transcription Transcription is catalyzed by RNA polymerase. start site nucleotides transcription complex
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8.4 Transcription –RNA polymerase bonds the nucleotides together. – Nucleotides pair with one strand of the DNA. DNA RNA polymerase moves along the DNA
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8.4 Transcription – The RNA strand detaches from the DNA once the gene is transcribed. RNA
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8.4 Transcription Transcription makes three types of RNA. –Messenger RNA (mRNA) carries the message that will be translated to form a protein. –Ribosomal RNA (rRNA) forms part of ribosomes where proteins are made. –Transfer RNA (tRNA) brings amino acids from the cytoplasm to a ribosome.
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8.4 Transcription RNA processing is also an important part of gene regulation in eukaryotes. mRNA processing includes three major steps.
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8.4 Transcription mRNA processing includes three major steps. –Introns are removed and exons are spliced together. –A cap is added. –A tail is added.
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