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The specific type of signaling molecule used by haploid yeast cell is ?
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- What characteristics make yeasts a good model for learning about signaling in humans?Describe the function of these molecules that help control the cell cycle A.) M-phase promoting factor B.) Cyclin C.) Cyclin dependent kinaseDescribe the process by which the forespore influences gene expression in the mother cell during sporulation in B. subtilis. To which of the eukaryotic signaling events described in the book are analogous?
- How is the purpose of cell signaling different in unicellular organisms vs. multicellular organisms? Provide an example of each.Even when not considering the different molecular signaling mechanisms, how can the three main body axes be inferred by just primitive streaklist some reason why a cell that has just completed cytokinesis might enter the G0 phase instead of the g1 phase.
- In plants, mature cells can revert to an undifferentiated state are called _______.The figure below shows the life cycle of the fungus Neurospora. The adult stage of the Neurospora is a multicellular haploid: a. Between which two stages of the Neurospora life cycle do most mitotic cell divisions occur? b. Neurospora has an arginine amino acid synthesis pathway shown below: Suppose I have a neurospora strain that has a mutation such that it will not grow unless I supplement the media (food) with arginine (but not with citrulline or ornithine). What gene is mutated? Explain your reasoning. c. Suppose I take the strain above that only grows with arginine supplements and cross it to a different mutant Neurospora strain that grows with arginine and citrulline supplements but not ornithine supplements. Assming genes A, B and C are unlinked and there is only one mutation per strain: i) What percentage of the progeny will grow on ornithine? ii) What percentage on citrulline? iii) What percentage on arginine? Show your work for i), ii) and iii). [Can be answered in less…List some reasons why a cell that has just completed cytokinesis might enter the G0 phase instead of the G1 phase.
- Which of the following is the primary method by which cyclin proteins are regulated to influence entry into the cell cycle or transition from one stage to the next? A. Transcriptional upregulation and translation followed by targeted ubiquitin-mediated degradation by a proteasome. B. Phosphorylation to regulate the activity of the kinase site. C. An activating phosphorylation and an inactivating phosphorylation. D. All of these are mechanisms that can be used to regulate cyclins.Which is true about cyclin B levels and/or activity? increasing during anaphase high during G1 beginning of degradation is brought about by APC/CCdc20 becomes phosphorylated prior to degradationWhich type of molecule acts as a signaling molecule in yeasts? a. steroid b. autoinducer c. mating factor d. second messenger