bio study notes DNA replication, transcription and translation

Bio study notes DNA replication, transcription and translation

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7.3 Transcription  7.1.1 Transcription is carried out in a 5'-3' direction. 7.3.2 Distinguish between the sense and antisense strands of DNA The antisense (non-coding) strand is the template DNA strand which is transcribed. The sense (coding) strand on the other hand is the DNA strand which has the same base sequence as the mRNA with thymine instead of uracil. 7.3.3 Explain the process of transcription in prokaryotes The synthesis of messenger RNA is called transcription. Transcription in prokaryotic cells happens in the nucle`iod regions for eukaryotic cells it happens in the nucleus. Transcription begins when RNA polymerase recognizes and binds to the promoter region on the double- stranded DNA molecule. RNA polymerase moves along the template strand of the DNA, synthesizing the complementary single-stranded messenger RNA molecule. Synthesis is in the 5' to 3' direction, with ribonucleoside triphosphate being used by RNA polymerase to extend the growing mRNA molecule. When RNA polymerase reaches a specific sequence of nucleotides on the DNA called the terminator, RNA polymerase stops transcription is released and the mRNA produced separates from the DNA. The DNA rewinds.
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