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3.PROTEIN SYNTHESIS overview
3.PROTEIN SYNTHESIS overview

... Ingram found that, in sickle cell anemia RBC’s, the amino acid ___________ substitutes for the normal amino acid in the protein This substitution leads to a change in the shape of the red blood cell (RBC) Ingram’s work showed that a gene specifies the _____________________of each amino acid in a pol ...
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RNA interference: the new somatic cell genetics?
RNA interference: the new somatic cell genetics?

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... Received 20 July 2005; accepted 17 November 2005; published online 21 December 2005 ...
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Crossword Puzzle: Protein Synthesis
Crossword Puzzle: Protein Synthesis

... 3. Sequence of nucleotides on DNA to with RNA polymerase will attach to start transcription 4. mRNA copying DNA's nucleotide sequence 5. 3 nucleotides on tRNA that match to a specific codon on mRNA 6. Type of RNA that helps make up ribosomes 7. Instructions for making proteins in cells 14. The numbe ...
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... transcription 4. mRNA copying DNA's nucleotide sequence 5. 3 nucleotides on tRNA that match to a specific codon on mRNA 6. Type of RNA that helps make up ribosomes 7. Instructions for making proteins in cells 14. The number of amino acids that exist 16. Number of strands making up RNA 19. DNA to RNA ...
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PROTIEN SYNTHESIS

... PROTIEN SYNTHESIS ...
< 1 ... 151 152 153 154 155 156 157 158 159 ... 168 >

RNA interference



RNA interference (RNAi) is a biological process in which RNA molecules inhibit gene expression, typically by causing the destruction of specific mRNA molecules. Historically, it was known by other names, including co-suppression, post-transcriptional gene silencing (PTGS), and quelling. Only after these apparently unrelated processes were fully understood did it become clear that they all described the RNAi phenomenon. Andrew Fire and Craig C. Mello shared the 2006 Nobel Prize in Physiology or Medicine for their work on RNA interference in the nematode worm Caenorhabditis elegans, which they published in 1998.Two types of small ribonucleic acid (RNA) molecules – microRNA (miRNA) and small interfering RNA (siRNA) – are central to RNA interference. RNAs are the direct products of genes, and these small RNAs can bind to other specific messenger RNA (mRNA) molecules and either increase or decrease their activity, for example by preventing an mRNA from producing a protein. RNA interference has an important role in defending cells against parasitic nucleotide sequences – viruses and transposons. It also influences development.The RNAi pathway is found in many eukaryotes, including animals, and is initiated by the enzyme Dicer, which cleaves long double-stranded RNA (dsRNA) molecules into short double-stranded fragments of ~20 nucleotide siRNAs. Each siRNA is unwound into two single-stranded RNAs (ssRNAs), the passenger strand and the guide strand. The passenger strand is degraded and the guide strand is incorporated into the RNA-induced silencing complex (RISC). The most well-studied outcome is post-transcriptional gene silencing, which occurs when the guide strand pairs with a complementary sequence in a messenger RNA molecule and induces cleavage by Argonaute, the catalytic component of the RISC complex. In some organisms, this process spreads systemically, despite the initially limited molar concentrations of siRNA.RNAi is a valuable research tool, both in cell culture and in living organisms, because synthetic dsRNA introduced into cells can selectively and robustly induce suppression of specific genes of interest. RNAi may be used for large-scale screens that systematically shut down each gene in the cell, which can help to identify the components necessary for a particular cellular process or an event such as cell division. The pathway is also used as a practical tool in biotechnology, medicine and insecticides.
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