lecture quiz 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Mycobacterium | Some bacterial groups lack typical cell wall structure
– Gram-positive cell wall structure with lipid mycolic
acid (cord factor)
• Pathogenicity and high degree of resistance to certain
chemicals and dyes
• Basis for acid-fast stain
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| Mycoplasma | bacteria with no cell wall
– Membrane is stabilized by sterols (absorbed from the
media-limiting factor)
– Pleomorphic
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| fluid mosaic model | Phospholipid bilayer with embedded proteins –
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| fluid mosaic model uses | Site for energy reactions, nutrient processing, and
synthesis
– Passage of nutrients into the cell and discharge of wastes
– Selectively permeable
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| CYTOPLASM | – Dense gelatinous solution of sugars, amino acids, and
salts
– 70-80% water
• Serves as solvent for materials used in all cell
functions
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| NUCLEOID REGION chromosome | – Single, circular, double-stranded
DNA molecule that contains all
the genetic information required
by a cell
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| NUCLEOID REGION Plasmids | – Free small circular, doublestranded DNA
– Not essential to bacterial growth and metabolism
– Used in genetic engineering
– Readily manipulated and transferred from cell to cell
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| PROKARYOTIC RIBOSOMES |
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