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.
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.
6.6. Determining Site Index from Field MeasurementsOnce height and age measurements are obtained for all site trees, site index can be determined.1. Produce height and age measurements for suitable site index trees following the protocol from Section 6.5. Data for two Douglas-fir trees are listed below in Table 6.