Lecture 2 - Cell Structure- Eukaryotes

Lecture 2 - Cell Structure- Eukaryotes - 1 Cell Structure...

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Unformatted text preview: 1 Cell Structure EUKARYOTES Electron micrograph of a fungal cell ( Cochliobolus heterostrophus ) Algae Fungi Protozoa 2 Prokaryotes vs. Eukaryotes • no true nucleus (no membrane surrounds DNA) • single, circular chromosome • 70s ribosomes • no membrane-bound organelles are present • no microtubules • no cytoplasmic streaming occurs • small cell size • membrane-bound nucleus contains chromosomal DNA • several chromosomes • 80s ribosomes in cytoplasm, 70s ribosomes in organelles • membrane-bound organelles present • cytoskeleton (microtubules and microflaments) present • cytoplasmic streaming occurs • larger cell size Eukaryotic cells are thought to have arisen through endosymbiosis. Insight 5.1 3 Algae and fungal cells are surrounded by cell walls that are very different in composition from bacterial cell walls. Typical eukaryotic cells Fig. 5.2 Eukaryotic cells have a membrane- bound nucleus. DNA is associated with histone proteins and organized into several chromosomes. 4 Membrane-bound organelles enable cells to carry out complex metabolic functions in spatially separated regions. N M ER Electron micrograph of fungal cell. (N = nucleus, ER = endoplasmic reticulum, M = mitochondria, V = vacuoles) V Materials can move from one organelle to another via transport vesicles. 5 The cytoplasmic membranes of eukaryotic cells are similar to those of prokaryotic organisms.those of prokaryotic organisms....
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Lecture 2 - Cell Structure- Eukaryotes - 1 Cell Structure...

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