Nonsense mutation in one gene of a transcription unit was found to prevent the expression of subsequent genes in the unit even though both genes had their own ribosome binding sites, an effect called polarity.

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#Id: 8598

#Unit 2. Cellular Organization

Labile factors called cyclins drive the progression of cells through different stages of the cell cycle by binding to CDKs.

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#Id: 3988

#Unit 2. Cellular Organization

By maintaining the unbound DNA in a relaxed state, topoisomerases facilitate the binding of histones to the DNA and the formation of additional nucleosomes.

Importantly, the overall effect on the plasmid is that the linking number is decreased as more nucleosomes are assembled

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#Id: 3978

#Unit 7. System Physiology – Animal

Myocardial fibers have a resting membrane potential of approximately –90 mV.

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#Id: 2753

#Unit 13. Methods in Biology

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#Id: 584

#Unit 2. Cellular Organization

Stimulation of b-galactosidase synthesis by cAMP with wild-type and mutant CAP.