MicroFinalRev - Exam1 &turnsneutralred :5.5 .Theflaskis inas

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Exam 1 Blood agar is a  differential  growth medium. Coliform bacteria makes acid from  lactose & turns neutral red . MacConkey agar contains a  pH  indicator. Select the pH that is most favorable for the growth of fungi:  5.5 . A bacterial culture is growing in a flask of nutrient broth. The flask is  in a shaking machine. There is a malfunction and over the next 12  hours the machine shakes too vigorously and the seal is lost from the  top of the flask. The culture becomes contaminated but cannot support  the growth of any  strict anaerobes . A bacterial cell is observed under the microscope. Its length is 2  micrometers. Using this to estimate the average length of a eukaryotic  cell, the eukaryotic cell is  20   micrometers. Select the correct characteristic of prokaryotic cells:  most of these   cells have a cell wall . In a bacterial cell the periplasm is/are the  compartment between 2  
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cell membranes . Most bacterial cell capsules are made of  polysaccharides . Select the incorrect association:  LPS/gram-positive bacteria . Porins in the outer bacteria cell membrane are  protein  molecules. Gram-negative bacteria  have  an outer cell membrane and are  resistant       to many toxic substances. Autolypins are enzymes that  break cross-linked bonds in   peptidoglycans . A bacterial cell is placed in an extra-cellular environment that has a  higher solute concentration compared to its intracellular makeup.  Inside the bacterial cell this  lowers its turgor pressure and the cell   wall shrinks . Mycoplasmas  lack a cell wall and lack a significant turgor   pressure . A bacterial cell that normally infects the human urinary tract loses its  pilli. This mainly affects its ability to  hold on to body cells .
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The greatest number of flagella is usually found on a bacterial cell  with a  peritrichous  arrangement. Axal filaments are found only in  spirochetes . The nucleal region of a bacterial cell  lacks a well-defined membrane   but has DNA . Most antibiotics interfere with the function of  70S  ribosomes and do  not interfere with the function of  80S  ribosomes. Endospores  have less than 3% H2O     .   Pseudomaein is found in cells of  archaea  (non-pathogenic, most  abundant microbes in nature, all extremophiles) Exam 1 Visible wavelengths of light are in the range of  400 – 700  nanometers.
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