RNA and Transcription. RNA V.S. DNA Different sugarDifferent sugar –Ribose instead of deoxyribose. –Different base pair –Uracil instead of thymine. –Different.

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RNA and Transcription

RNA V.S. DNA Different sugarDifferent sugar –Ribose instead of deoxyribose. –Different base pair –Uracil instead of thymine. –Different structure –Single helix instead of double. RNA is made from DNA

Three types of RNA mRNA (messenger)mRNA (messenger) –“transcribes” DNA in the nucleus and brings code to the ribosome tRNA (transfer)tRNA (transfer) –Brings amino acids to the ribosome to make protein rRNA (ribosomal)rRNA (ribosomal) –Part of the ribosome structure

transcription When mRNA copies the “code” for a gene from the DNA in the nucleus.When mRNA copies the “code” for a gene from the DNA in the nucleus. To bring the information to the ribosome to make protein.To bring the information to the ribosome to make protein. Making mRNA

Steps of transcription Making mRNA 1.DNA has “promoters” sites where RNA polymerase bind to DNA. 2.DNA untwists and unzips in area of molecule where the code for a certain protein is held. 3.RNA polymerase adds complementary base pairs 4.Stops when reaches “termination signal” 5.RNA is released from DNA and leaves the nucleus