8.4 Transcription
RNA carries DNA’s instructions.
• The central dogma
states that
information flows in
one direction from
...
8.4 Transcription
•

The central dogma includes three processes.
– Replication
– Transcription
replication
– Translation
•...
8.4 Transcription
• RNA differs from DNA in three major ways.
– RNA has a ribose sugar.
– RNA has uracil instead of thymin...
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
tr...
8.4 Transcription
2.

– Nucleotides pair with one strand of the DNA.
– RNA polymerase bonds the nucleotides together.
– Th...
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 transl...
8.4 Transcription
The transcription process is similar to replication.
• Transcription and replication both involve
comple...
8.4 Transcription
The transcription process is similar to replication.
• Transcription and replication both involve
comple...
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Transcription ch 8.4

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Transcription ch 8.4

  1. 1. 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.
  2. 2. 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.
  3. 3. 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.
  4. 4. 8.4 Transcription Transcription makes three types of RNA. • Transcription copies DNA to make a strand of RNA.
  5. 5. 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
  6. 6. 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
  7. 7. 8.4 Transcription 3. – The RNA strand detaches from the DNA once the gene is transcribed. RNA
  8. 8. 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.
  9. 9. 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.
  10. 10. 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.

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