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Transcript
The DNA connection Coulter The genetic code The main function of genes is to control the production of proteins in an organism’s cells. Proteins help to determine the size, shape, color, and many other traits of an organism. Genes and DNA: recall; chromosomes are mostly DNA. DNA has four different nitrogen basis (A adenine, T thymine, G guanine, C cytosine) Gene and DNA A gene is a section of DNA that contains information to code for one protein. Made up of a series of bases in a row. A single gene may contain millions or more bases. each gene is located at a specific place on a chromosome Order of the bases The order of the nitrogen bases along a gene forms a genetic code that specifies what type of protein will be produced. Example: CGT, always codes for the amino acid alanine. How cells make proteins During protein synthesis, the cell uses information from a gene on a chromosome to produce a specific protein. Protein synthesis takes place on the ribosomes in the cytoplasm. The chromosomes are found in the nucleus. How does the information needed to produce proteins get to the ribosomes? The role of RNA Before the ribosomes can synthesis protein a messenger must carry the genetic code from the DNA inside the nucleus into the cytoplasm. The genetic messenger is RNA (ribonucleic acid) Unlike DNA (two strands), RNA has only one strand. RNA contains different sugar molecules. RNA also has four nitrogen bases (adenine, guanine, cytosine, and uracil) Type of RNA Messenger RNA copies the coded message from the DNA in the nucleus, carries the message to the ribosomes. Transfer RNA, carry amino acids to ribosomes and adds them to the growing protein. Translating the code
