Biology 311C Lecture 11 - September 19, 2011 Biology 311C...

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September 19, 2011 Biology 311C Lecture 11 **What’s the difference between chromosome, chromatin, and DNA? DNA is made out of chromosomes which contain many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions. Chromatin is the combination of DNA and proteins that make up the contents of the nucleus of a cell. Chromatin is a “spaghetti mess”; it is loose DNA. It is making mRNA from DNA and translated into protein. DNA needs to wrap around proteins so it can fit inside the nucleus. Ribosomes are particles made of ribosomal RNA and protein. Ribosomes are found in the cytosol, bound to the endoplasmic reticulum, and bound to the nuclear envelope. Ribosomes make polypeptide chains based on the template that is found in mRNA. mRNA feeds through ribosomes and codes for amino acids.
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This note was uploaded on 02/21/2012 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas at Austin.

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