11-05-09 - 1 What is the function of cell division 2 What...

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Further comments on signal transduction pathways Amplification of the signal Specificity of responses Target cells
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Reception Transduction Response Binding of epinephrine to G protein-coupled receptor (1 molecule) Inactive G protein Active G protein (10 2 molecules) Inactive adenylyl cyclase Active adenylyl cyclase (10 2 ) ATP Cyclic AMP (10 4 ) Inactive protein kinase A Active protein kinase A (10 4 ) Inactive phosphorylase kinase Active phosphorylase kinase (10 5 ) Inactive glycogen phosphorylase Active glycogen phosphorylase (10 6 ) Glycogen Glucose-1-phosphate (10 8 molecules) Figure 11.13 Cytoplasmic response to a signal: the stimulation of glycogen breakdown by epinephrine
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Reading Assignment: Chapter 12, pp 228 - 245 Cell Reproduction
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Cell Reproduction
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Unformatted text preview: 1. What is the function of cell division? 2. What must be accomplished when a cell divides? • Bacteria – Binary fission • Eukaryotic Cells – Mitosis – Cytokinesis – Meiosis Cell Reproduction Fig. 12-3 20 µm • Interphase – G 1 , S , G 2 • Mitosis The Cell Cycle Fig. 12-5 S (DNA synthesis) MITOTIC (M) PHASE Mitosis Cytokinesis G 1 G 2 Fig. 12-4 0.5 µm Chromosomes Chromosome duplication (including DNA synthesis) Chromo-some arm Centromere Sister chromatids DNA molecules Separation of sister chromatids Centromere Sister chromatids Phases of M itosis: Prophase Prometaphase Metaphase Anaphase Teleophase Cytokinesis Figure 12.6 The Mitotic Division of an Animal Cell...
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11-05-09 - 1 What is the function of cell division 2 What...

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