HTHSCI 1LL3 Lecture Notes - Lecture 2: Lac Operon, Histone Acetyltransferase, Chromatin Remodeling
11 Dec 2014
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Document Summary
Most of our cells contain the same genes but only certain genes are transcribed in the cells of each type of tissue. There are also differences in gene expression at different life stages. Gene expression is a very complex process in eukaryotes and there are several different ways to regulate expression. Don"t want all genes in the cell to be expressed all the time. It is advantageous to both prokaryotes and eukaryotes to regulate activity of their genes. This helps the cells adapt to changes in their environment (eg. bacteria expressing genes to use different food sources); the main reason in eukaryotes is cell specialization. It also helps save the cell"s energy since transcription and translation consume a great deal of energy. Less complex; only at the level of transcription. Are able to begin translation before completing. Prokaryotic genes that code for proteins with similar often grouped together and under the control of a single.
