what is the difference between a gram positive and gram negative bacteria?
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Gram Positive bacteria have a different membrane structure than gram negative bacteria.  This results in a different uptake of a staining techinque where gram positive bacteria stain pink while gram negative stain purple.
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It's the cell wall. The peptidoglycan in the gram positive bacterial cell wall retains the crystal violet and make them look purple in color.
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eukarotic bacteria are unicellular; fungi can be multicellular whereas bacteria can not. Bacteria move themselves by means of a flagella unlike fungi which don't. Bacteria lack a nucleous and mitochondria unlike fungi. Many bacteria have differing cell walls from fungi. I believe the term used is peptidoglcoans, which describes the cell wall.
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Type B refers to the bacterial strain haing  a specific type of long sugar chains that cover the bacterial cell forming the capsule. U must be aware of the fact that any bacteria a covered by a capsule made of sugar/polysachs. some bacterial strains are classified based on teh type of sugar chains they bear on their surface (which may act as antigen to be recognized by host immune system).
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If you are trained in microbiology you can tell by eye.  Plate out the bacteria (for single colonies) onto a universal media that is suitable for your target bacteria,  ie CLED, Maconkeys, Blood, Chocolate.  Incubate until there is a growth (usually 24hrs at 37 degreees celcsius is aerobic).  Look at the plate, are the colonies uniform in appearence.\n\nIf you are using liquid culture youu could use microscopy before plating out.  Either a gram stain or a direct (wet prep). This would let you know if you had all gram positives or all gram negatives or all rods or all  cocci or a mixture.  You would still have to plate out to make sure only one colony type grows.
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Mycobacteria and Corynebacterineae are two of the most common types of bacteria that are acid fast positive.
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the bacteria's cell membrane is semi permeable to certain molecules.  bacteriacides probably have some form of "nutrient" in them to confuse the bacteria into taking it in.  It is sort of like rat poison.
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After Gram stain, they look like short thick Gram Negative bacilli.  They are non- fermenters, as are Pseudomonas aeruginosa.  AFAICR, they grow poorly in the absence of oxygen.  They grow on MacConkey agar.\n\nAfter a while, you learn to pick them, by colony morphology.\n\n:-)\n\nOf course, we go on to do proper identification tests .... after all, it could turn out to be another Gram Negative non- fermenter.
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here are lists and pictures\n\nhttp://www.buddycom.com/bacteria/gpc.html
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bacteria are prokaryotic(no nucleus)
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Oil immersion objective has got magnification of 100X and used for observing slide which are Gram Stained.  Gram staining is nothing but a technique of staining bacteria to confirm their Gram Nature i.e. Gram positive or Gram Negative\n\nhttp://biology.clc.uc.edu/fankhauser/Labs/Microscope/Oil_Immersion.htm\n\nhttp://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artmar02/pjoil.html
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Aren't most molds Gram negative (Pink)?
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they are chemicals secreted by certain bacteria which kill other bacteria. the wikipedia page has many examples ....gram positive, gram negative, etc...
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Gram-positive bacteria :\nGram-positive bacteria are classified as bacteria that retain a crystal violet dye during the Gram stain process. Gram-positive bacteria will appear blue or violet under a microscope, whereas Gram-negative bacteria will appear red or pink. The difference in classification is largely based on a difference in the bacteria's cell wall structure.\nThe following characteristics are generally present in a Gram-positive bacteria:\nA very thick cell wall (peptidoglycan) \nIf a flagellum is present, it contains two rings for support (an additional two rings are not necessary, unlike in Gram-negative bacteria, because the thick cell wall is supportive enough) \nTeichoic acids are present, which serve to act as chelating agents, and also for certain types of adherence \nIn the original bacterial phyla, the Gram-positive forms made up the phylum Firmicutes, a name now used for the largest group. It includes many well-known genera such as Bacillus, Listeria, Staphylococcus, Streptococcus, Enterococcus, and Clostridium. It has also been expanded to include the Mollicutes, bacteria like Mycoplasma that lack cell walls and so cannot be stained by Gram, but are derived from such forms.\n\nThe actinobacteria are another major group of Gram-positive bacteria; they and the Firmicutes are referred to as the high and low G+C groups based on the guanosine and cytosine content of their DNA. If the second membrane is a derived condition, the two may have been basal among the bacteria; otherwise they are probably a relatively recent monophyletic group. They have been considered as possible ancestors for the archaeans and eukaryotes, both because they are unusual in lacking the second membrane and because of various biochemical similarities such as the presence of sterols.\n\nThe Deinococcus-Thermus bacteria also have Gram-positive stains, although they are structurally similar to Gram-negative bacteria.\n\nBoth Gram-positive and Gram-negative bacteria may have a membrane called an S-layer. In Gram-negative bacteria, the S-layer is directly attached to the outer membrane. In Gram-positive bacteria, the S-layer is attached to the peptidoglycan layer. Unique to Gram-positive bacteria is the presence of teichoic acids in the cell wall. Some particular teichoic acids, lipoteichoic acids, have a lipid component and can assist in anchoring peptidoglycan, as the lipid component is embedded in the membrane.\n\nGram Negative Bacteria:\nGram-negative bacteria are those that do not retain crystal violet dye in the Gram staining protocol. Gram-positive bacteria will retain the dark blue dye after an alcohol wash, whereas Gram-negative bacteria do not. In a Gram stain test, a counterstain is added after the crystal violet, which colors all Gram-negative bacteria a red or pink color. The test itself is useful in classifying two distinctly different types of bacteria based on structural differences in their cell walls.\n\nMany species of Gram-negative bacteria are pathogenic, meaning they can cause disease in a host organism. This pathogenic capability is usually associated with certain components of Gram-negative cell walls, in particular the lipopolysaccharide (also known as LPS or endotoxin) layer.\nThe following characteristics are displayed by Gram-negative bacteria:\n\nCell walls only contain a few layers of peptidoglycan (which is present in much higher levels in Gram-positive bacteria) \nCells are surrounded by an outer membrane of lipopolysaccharide outside the peptidoglycan layer \nPorins exist in the outer membrane, which act like pores for particular molecules \nThere is a space between the layers of peptidoglycan and the secondary cell membrane called the periplasmic space \nThe S-layer is directly attached to the outer membrane, rather than the peptidoglycan \nIf present, flagella have four supporting rings instead of two \nNo teichoic acids are present \nLipoproteins are attached to the polysaccharide backbone whereas in Gr
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Bacteriocins are toxins that are produced by bacteria to kill  similar types of bacteria. Just as there is competition between different species of bacteria, there is also competition between different strains of the same species. They have similar mechanisms to most antibiotics. Many types of bacteria produce bacteriocins including Baccilli, Enteric bacteria (e.g. E.coli), and most gram-positives.
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Bacteria are capable of living alone. Viruses are said to be alive only when inside a living cell.\n\nBacteria have cell organelles and show life activities. Virus are just a core of DNA or RNA surrounded by a sheath of protein and can only show reproduction while in a living cell.\n\nBacteria are intercellular organisms( they live in-between cells ). Viruses are intracellular organisms ( they live within/inside cells )\n\nThere are many useful bacteria, that help in processes like nitrification and lactification. Viruses on the other hand are always disease causing. In fact, the term 'Virulesence', which is used for a disease causing organism, is derived from the word Virus'
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what is the difference between the two