Ribosome Reads mRNA Directs tRNA Creates peptide bonds between AAs (makes polypeptide chain) What Do We Need For Protein Synthesis? How exactly do all those letters in DNA code for making a living thing?

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PROTEIN SYNTHESIS R.J. Schneider INTRODUCTION The regulation of protein synthesis is an important part of the regulation of gene expression. endstream Chapter 11 Nucleic Acids and Protein Synthesis 25 Genes • Individual sections of DNA molecules make up the genes, which are the fundamental units of heredity that direct the synthesis of proteins.

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0 The types of protein produced within a cell depend on the information stored in the cell’s DNA (deoxyribonucleic acid). 32 0 obj <> endobj endobj A ribosome Protein synthesis involves three distinct stages: transcription; translation; and protein folding 1. Transcription Transcription is the making of messenger RNA using a DNA template.Enzymes unwind the double helix and separate the two strands by breaking the hydrogen bonds… 3. •Information is copied from DNA into mRNA, this is transcription •mRNA leaves the nucleus and enters the cytoplasm of the cell •Ribosomes use the mRNA as a blueprint to synthesize proteins composed of aa, this is translation. AS 8 PROTEIN SYNTHESIS QUESTIONSHEET 19 (a) when lactose is absent gene i becomes active; gene i codes for the synthesis of a repressor protein; the repressor protein binds to the operator site; this blocks the process of transcription of genes z, y and a (onto messenger RNA); since it blocks the action of RNA polymerase/will not allow RNA polymerase to move along DNA (from the promotor region !T�&���\�¶��܇e�A�VU�- +��(��d�@��_�5�z�-菻 g��Y�UR�"�+�; wH�,T>$ے,$��Q��H_A�6���*�ж^1�n��U�*`.|�)����Rh\�� �{��'�9��|q����ã9Q������8=LA�=�O��"��t�R��T[(����Y�3�p�Vp2�ך��#�_�Aʣ�v�!� Contents Introduction .....1 DNA Transcription .....1 The Primary Transcript .....4 Translation .....7 Protein Structure.....11 References .....11 Resources .....11 Introduction The genetic message carried on the DNA molecule is a code. Protein Synthesis: An Overview •The answer lies in an intermediate substance known as mRNA. In eukaryotic cells, DNA is housed in the nucleus.

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