Global warming is occurring rapidly in Arctic marine and terrestrial ecosystems, including tundra and northern coniferous forests. In such locations, re- flective white snow and ice cover are melting more quickly and extensively, uncovering darker-colored ocean water, plants, and rocks. In a short essay (100150 words), explain how this process might represent a positive-feedback loop.
LECTURE 1.19.17 cell cycle, mitosis, gene expression and regulation- quiz topics for next Thursday PROKARYOTIC REGULATION negative regulation- regulatory proteins turn transcription of positive regulation- regulatory protein turns the rate of transcription up regulatory protein- a repressor that is produced in an active form inducible- of until turned on...induces transcription repressible- on until turned of...tryptophan presence is high EUKARYOTIC REGULATION chromatin level- can have euchromatin (transcribable) or heterochromatin (non- transcribable) transcription level- transcription factors are required to initiate transcription genes are regulated more though positive regulation then negative Roles of transcription factors: o
