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Transcription ch 8.4
 

Transcription ch 8.4

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    Transcription ch 8.4 Transcription ch 8.4 Presentation Transcript

    • 8.4 Transcription RNA carries DNA’s instructions. • The central dogma states that information flows in one direction from DNA to RNA to proteins. 1. 3. 5.
    • 8.4 Transcription • The central dogma includes three processes. – Replication – Transcription replication – Translation • RNA is a link between 2. transcription DNA and proteins. translation 4.
    • 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.
    • 8.4 Transcription Transcription makes three types of RNA. • Transcription copies DNA to make a strand of RNA.
    • 8.4 Transcription • Transcription is catalyzed (run) by RNA polymerase. 1. – RNA polymerase and other proteins form a transcription complex. – The transcription complex recognizes the start of a gene and unwinds a segment of it. transcription complex start site 4. 5. nucleotides
    • 8.4 Transcription 2. – Nucleotides pair with one strand of the DNA. – RNA polymerase bonds the nucleotides together. – The DNA helix winds again as the gene is transcribed. 6. DNA 7. RNA polymerase moves along the DNA
    • 8.4 Transcription 3. – The RNA strand detaches from the DNA once the gene is transcribed. RNA
    • 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.
    • 8.4 Transcription The transcription process is similar to replication. • Transcription and replication both involve complex enzymes and complementary base pairing. • The two processes have different end results. – Replication copies all the DNA; transcription copies one a gene. gene growing RNA strands – Replication makes one copy; DNA transcription can make many copies.
    • 8.4 Transcription The transcription process is similar to replication. • Transcription and replication both involve complex enzymes and complementary base pairing. • The two processes have different end results. – Replication copies all the DNA; transcription copies one a gene. gene growing RNA strands – Replication makes one copy; DNA transcription can make many copies.