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Lecture2

Terms in this set (30)

Function:
Passive diffusion - Net movement of gases or small-uncharged polar molecules across a phospholipid bilayer. Some small hydrophobic uncharged molecules may pass the membrane by diffusion.

Facilitated Diffusion - Transport of substances across a membrane by transport proteins. Hydrophilic and charged molecules must be specifically transported. Because they are charged. Facilitated diffusion is powered by the potential energy of a concentration gradient and does not require the expenditure of metabolic energy. Only water can penetrate freely, however water transport can be accelerated by transport protein called aquaporin.

Active transport - Is a process whereby the cell uses both transport proteins and metabolic energy to transport substances across the membrane against the concentration gradient. In this way, active transport allows cells to accumulate needed substances even when the concentration is lower outside. Group translocation is another form of active transport that can occur in prokaryotes. In this case, a substance is chemically altered during its transport across a membrane so that once inside, the Cytoplasmic membrane becomes impermeable to that substance and t remains within the cell.

Energy production - (The electron transport system for bacteria with aerobic and anaerobic respiration; photosynthesis for bacteria converting light energy into chemical energy). The membrane is in charged form in which a separation of H+ from OH- occurs across its surface. This energized state of membrane is called the proton motive force (PMF) which is responsible for driving many energy requiring functions. (active transport, motility, ATP)
Containing the bases of bacterial flagella used in motility

Waste removal - By enzymes called translocases- export proteins z outside the sell

Formation of endospores
Binary fission