RNA and Protein Synthesis Chapter 11 C10L10C12. What are Genes? Genes are coded DNA instructions that control the production of proteins within the cell.

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 Nucleic acid similar to DNA.  Made of sugar ribose.  Generally single stranded.  Instead of thymine, uses uracil (U)
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Presentation transcript:

RNA and Protein Synthesis Chapter 11 C10L10C12

What are Genes? Genes are coded DNA instructions that control the production of proteins within the cell C10L10C12

Central Dogma DNARNA Proteins Transcription Occurs in the Nucleus C10L10C12

What is RNA? 1.The Sugar in RNA is ribose instead of deoxyribose Similar to DNA EXCEPT it differs in 3 ways : C10L10C12

What is RNA? 2.RNA is single stranded (not double stranded like DNA) Similar to DNA EXCEPT it differs in 3 ways : C10L10C12

What is RNA? 3.RNA contains the nitrogen base Uracil instead of Thymine (but it’s still a pyrimadine) Similar to DNA EXCEPT it differs in 3 ways : AdenineUracil In RNA There is no Thymine Adanine bonds to Uracil A – U In RNA There is no Thymine Adanine bonds to Uracil A – U C10L10C12 Let’s make an RNA strand DNAATGCAC mRNA UAGGCU

Why use RNA? RNA is a throw away copy of DNA that can leave the nucleus DNA can not leave the nucleus RNA can!! DNA can not leave the nucleus RNA can!! C10L10C12

Types of RNA 1.Messenger RNA (mRNA) –Carry copies of instructions for the assembly of amino acids into proteins –Serve as “messengers” from DNA to the rest of the cell 2.Ribosomal RNA (rRNA) –Helps build ribosomes 3.Transfer RNA (tRNA) –Transfers the amino acid to the ribosome There are 3 types of RNA : C10L10C12

Protein Synthesis 1.Transcription –Takes place in the nucleus. 2.Translation –Takes place in the ribosome. Consists of 2 main stages: C10L10C12

Transcription This is the stage where the RNA is made from a strand of DNA using the enzyme RNA polymerase. This occurs in the nucleus of the eukaryotic cell. C10L10C12

What happens during transcription? 1.The RNA polymerase will bind to the DNA at a specific site known as the promoter. ( the start signal region of DNA) 2.RNA polymerase will unwind the DNA helix and separate the 2 strands. 3.RNA polymerase moves along the DNA using one strand of DNA as a template and base pairs a new RNA strand until it reaches a STOP codon and falls off. 4.The DNA then rewinds itself back into a helix C10L10C12

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