General principles of cell communication
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Answer:
Explanation:
Cellular communication is a stepwise process that involves the generation of an extrinsic signal, detection of the signal by a receptor, transduction of the signal by intracellular signalling molecules and a cellular response. When the extrinsic signal is removed, cellular communication processes cease.
Answer:
Cellular communication is a stepwise process which involves the generation of an extrinsic signal, detection of the signal by a receptor, transduction of the signal by intracellular signalling molecules and a cellular response. When the extrinsic signal is removed, cellular communication processes cease.
Explanation:
General principles of cell communication
In the world of unicellular organisms, mechanisms by which one cell could influence the behavior of another almost certainly existed long before multicellular organisms appeared on Earth. The evidence comes from studies of modern unicellular eukaryotes such as yeast. Although these cells normally lead independent lives, they can communicate and influence each other's behavior in preparation for sexual mating. For example, in the budding yeast Saccharomyces cerevisiae, when a haploid individual is ready to mate, it secretes a peptide mating factor that signals cells of the opposite mating type to stop reproduction and prepare for mating.
The subsequent fusion of two haploid cells of opposite mating types produces a diploid cell, which can then undergo meiosis and sporulation, producing haploid cells with new sets of genes. Studies of yeast mutants unable to mate have identified many proteins required for the signaling process. These proteins form a signaling network that includes cell surface receptor proteins, GTP-binding proteins, and protein kinases, each of which has close relatives of signaling proteins in animal cells. However, thanks to gene duplication and divergence, animal signaling systems have become much more complex than those of yeast.
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