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Micro - Chapters 3&4

Lecture Assignment

QuestionAnswer
You discover a new pathogen which you visualize using a light microscope. A negative stain reveals a clear halo around the cells. This suggests to you that the organism has a capsule.
Which of the following bacteria lack(s) a peptidoglycan cell wall? Mycoplasma pneumoniae
Which terms refer to bacterial morphology? Coccus AND Bacillus
Chemotaxis refers to movement in response to a chemical
Smooth endoplasmic reticulum is involved in protein synthesis. False
Mitochondria and chloroplasts are thought to have once been free-living bacteria that invaded another cell. True
Which may result in Gram-positive bacteria appearing to be Gram-negative? Decolorizing for too long AND using old bacterial cultures.
Facilitated diffusion and active transport both transport molecules into or out of a cell.
Which microscope would be the BEST selection for examination of a virus? Scanning electron microscope
Why must the lenses and specimen be in a vacuum when using an electron microscope? Electrons are particles but there are other particles in air as well. Without a vacuum, the electrons would strike and be scattered by the particles within the air.
Which amino acid is found only in the cell walls of bacteria? Diaminopimelic acid
Which of the following statements about flagella, pili and archaella is CORRECT? Bacteria move by means of flagella, while archaea move by means of archaella.
The use of oil with certain high-power objective lenses increases resolution.
Cilia and flagella project from the cell and are not covered by cytoplasmic membrane. The proton motive force involves moving electrons from one side of the nuclear membrane to the other.
The cell wall of Gram-positive bacteria contains a thick layer of peptidoglycan.
Which is NOT true of the cytoplasmic membrane? It consists mainly of a fixed, static, phospholipid bilayer.
Which of the following is NOT a function of teichoic acids in the bacterial cell wall? They are important in spindle formation during mitosis.
Which of the statements about biofilms is TRUE? Biofilms may protect organisms against harmful chemicals.
Bacteria may be stored for several months on a slant in the refrigerator, frozen in glycerol solution AND freeze-dried.
There are five stages of growth in an open system of culture. False
MacConkey agar is a selective and differential medium.
Clostridium paradoxum grows optimally at 55°C, pH 9.3; it will not grow in the presence of image.Please select the TRUE statement about this organism. It is an obligate anaerobe.
Shake tubes are used to determine the oxygen requirements for bacterial growth.
A single bacterial cell may multiply to form a visible colony on a culture medium. True
In microbiology, growth usually refers to an increase in size of the bacteria. False
Which of the following are TRUE regarding trace elements? They include zinc, copper, and manganese AND they may be needed for enzyme function.
Products that limit pH changes are often incorporated into media and are referred to as buffers,
Carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur may be considered major elements
Secondary metabolites produced during bacterial growth may be antibiotics. true.
The prefix photo- in the term photoautotroph indicates that an organism will make use of_________ for energy purposes. light
The lag phase of the bacterial growth curve is characterized by metabolically active cells.
During which phase of the bacterial growth curve does the total number of viable (live) cells decline? death
You leave several tomatoes in your refrigerator when you go on vacation. When you get home, the tomatoes are covered in microbial growth. Select the best description for these microbes. They are acidophilic, psyhrotrophic aerobes.
Prokaryotic cells divide by a process known as binary fission.
High concentrations of salt and sugar in foods are useful in preserving the food AND tend to draw water out of a cell.
Created by: asiap23
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