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8 Cards in this Set
- Front
- Back
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functioning of trp operon |
A single promoter serves all five genes. Trp is a repressible operon, so as long as tryptophan is not attached to operator, RNA Polymerase can bind to promoter and begin transcription. Operons genes are transcribed, and so is mRNA molecule with five separate codons marking five polypeptide subunits that give rise. |
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repressible operon |
Operon whose transcription is usually on but can be repressed when a small molecule binds to regulatory protein |
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Inducible Operon |
Operon whose transcription is usually off, but can be induced when a small molecule binds to a regulatory protein |
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Describe how histone acetylation promotes transcription |
histones that are acetylated cause an opening of the chromatin structure, causing it to be less compact and the DNA accesible for transcription |
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How does chromatin modification lead to epigenetic inheritance? |
Future generation of cells are altered, rather than the nucleotide sequence of DNA. |
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the lac operon |
Similar to trp operon, but it is inducible. Allolactose must bind to the repressor connected to the operator to render it inactive. Then RNA Polymerase transcribes 3 lac genes, and an mRNA molecules, that marks 3 codons, producing 3 polypeptides |
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What are Cytoplasmic determinants and what role do they play in embryonic development? |
Maternal substances in the egg that alter this development. mitosis distributes the zygote's cytoplasm into separate cells. The nuclei of these cells may be exposed to these determinants, thus regulating expression of the cell's genes during differentiation |
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Explain the role if apoptosis? |
Aloptosis kills the original cells inside the vertebrae hands? which then allows the bones of the hand to grow and extend individual digits (fingers) |
