As always I love posting videos from Mr. Anderson because he explains stuff so well. It's like having a personal teacher at your finger tips! Anyways, this video is about the regulation of genes in both prokaryotes and eukaryotes. He also talks about operons, which are clusters of genes under transcriptional control of one promoter in bacterial cells. Another thing he explains is the importance of transcription factors in eukaryotic gene expression. Overall, this video is quite helpful...but I mean lets be honest, all of his videos are helpful (am I right or am I right?).
This video is a NDSU Virtual Cell Animation that talks about lac operon. Is it just me or do these videos creep you out too? The music at the beginning of each video is quite creepy and mysterious. But I'm not here to talk about creepy music, I'm here to talk about this awesome video. The video explains lac operon, which is an operon required for the transport and metabolism of lactose in Escherichia coli and some other bacteria. It consists of three adjacent structural genes, lacZ, lacY and lacA. The lac operon is regulated by several factors including the availability of glucose and of lactose. If lactose is absent, the gene is turned off; if lactose is present, the gene is turned on. In the absence of lactose, a repressor protein (made by the lacI gene) binds to the operator region upstream of the lacZ, lacY and lacA genes and prevents the lactose utilization gene from being transcribed.
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