Microbiology 2051 Essay

5219 Words Apr 20th, 2013 21 Pages
MICROBIOLOGY 2051 BRINNINSTOL Characteristics of Cells: true of all living cells * Communicate with environment * Molecules being exchanged—recognized by other cells—causes cell to do something (releasing toxins; move) * Growing—one cell divides and becomes two cells (binary fisson) * Some form appendages—form differently, look dfrnt, function dfrnt—spores, cysts, flagella * Evolve—ancestral cell Microbial Communities Table 1.1 More water than land Most microbes in soil Origin of Earth * 3.8 billion years ago—evidence of microbial cells Agriculture * Bacteria in plant (soybean plant) fixes nitrogen to usable nitrogen for environment * Cows have microbes in …show more content…
Bacteria cells grow faster than eukaryotes. BECAUSE cell size to volume ratio; there’s less to do; takes in less food (less surface area) and its easier to rid waste (less volume to travel thru) *STRUCTURE is the most missed question on the exam

*STRUCTURE is the most missed question on the exam

Basic components of ALL microbial cells: * Cytoplasm, cytoplasm membrane, and ribosomes, DNA Prokaryotic Microbes * Nucleoid: is SPACE where the DNA is found; can be anywhere in the cell; usually found together BUT NOT forced to be together * Cytoplasm, cytoplasm membrane, ribosomes, plasmid * *Can have cell wall Eukaryotic Microbes * Cytoplasm, cytoplasmic membrane, ribosomes * Endoplasmic reticulum, golgi * Nucleus, nucleolus, nuclear membrane * *Can have mitochondrion, chloroplast (photosynthetic) * *Can have cell wall Cytoplasmic Membrane: “fluid” membrane, lipid and protein layer STRUCTURE: * Have transport proteins—some highly selective * Phospholipid bilayer: hydrophobic, fatty acids inside: hydrophilic, gylerical heads on outside * Archae lipid monolayer: glyerical heads and continuous fatty acid “legs” * *Much more resistant to peeling apart than BILAYERS because of molecular

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