chapter 2 – cell structure & the cell cycle. plant cells
TRANSCRIPT
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Chapter 2 – Cell structure & the cell cycle
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Plant Cells
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What distinguishes plant cells?
Plastids (chloroplasts, etc.) Cell wall Large central vacuole Plant cell specific connections
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Where are the chloroplasts?
Plastids– Chloroplasts– Leucoplasts
Amylopasts Elaioplasts (niyb)
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Plastids - Chromoplasts
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Chloroplasts, mitochondria and endosymbiosis
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Chloroplast Genome
Circular DNA molecule Replicate independently Sequence characteristics
resembles that of bacteria
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Paramecium with endosymbiont Chlorella
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Plant cell walls Primary cell walls Secondary cell walls
-for structural support
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Cell walls Pectins (proteins) and hemicelluloses
(carbohydrates) link cellulose molecules together
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Cell Walls
Lignin strengthens & waterproofs secondary cell walls
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Plant cell connections
Middle lamella (pectins) hold cells together
Bordered pits speed water and solute diffusion through cells with secondary cell walls
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Bordered pits
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Plant cell connections
Plasmodesmata provide cytoplasmic connections between cells
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Plasmodesmata
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Cytoskeleton
Microtubules Microfilaments Motor proteins
(walking molecules)
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Movement in plant cells and the cytoskeleton
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