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