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3.2: Comparing Prokaryotic and Eukaryotic Cells - Biology

Cells fall into one of two broad categories: prokaryotic and eukaryotic. The predominantly single-celled organisms of the domains Bacteria and Archaea are classified as prokaryotes (pro- = before; -karyon- = nucleus). Animal cells, plant cells, fungi, and protists are eukaryotes (eu- = true).Components of Prokaryotic CellsAll cells share four common components: 1) a plasma membrane, an outer covering that separates the cell’s interior from its surrounding environment; 2) cytoplasm, consisting of a jelly-like region within the cell in which other cellular components are found; 3) DNA, the genetic material of the cell; and 4) ribosomes, particles that synthesize proteins.
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15.6D: Bovine Spongiform Encephalopathy - Biology

Bovine spongiform encephalopathy (BSE) is a fatal neurodegenerative disease in cows.Learning ObjectivesRecognize the route of transmission and causes of bovine spongiform encephalopathy (BSE)Key PointsBSE is probably caused by a misfolded protein known as a prion; a prion can cause other correctly folded proteins to misfold thus propagating the disease.
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