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MBY 251 Exam Questions With Correct Answers
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MBY 251 Exam Questions With Correct AnswersWhy is the morphology of a bacterial cell important?- Answer Nutrient uptake
Swimming motility
Gliding motility
Coccus - Answer A spherical bacterium.
Bacillus - Answer Rod shaped bacteria
Spirillum - Answer spiral shaped bacteria
Spirochete - Answer spiral shaped bacteria
Epulopiscium fisheloni - Answer Giant Bacterium
Thiomagarita - Answer Giant Bacterium
How does the Epulopiscium fisheloni insure that it survives? - Answer It has multiple
copies of the same genes
How can nanobacteria have enough DNA to survive? Answer They live in symbiosis with
other organisms
Is there a lower limit on the size for a cell? Answer Yes. A cell can't be too small to
contain it's own DNA.
, Why does the cytoplasmic membrane have to be fluid? Answer Allows movement
Easy repair
What is the structure of the cytoplasmic membrane? Answer Phospholipid bilayer
Fatty acid inward
Glyceraldehyde phosphate outward
Cell membrane function- Answer Permeability barrier
Nutrient transport
Peptidoglycan composition - Answer glycan backbone(2 sugars & amino acids)
Peptidoglycan sugars- Answer N-acetylglucosamine
N-acetylmuramic acid
Peptidoglycan amino acids- Answer Alanine (D&L)
Glutamic Acid (D)
Lysine / diaminopimelic acid
Gram negative peptidoglycan cross linking- Answer Direct link between DAP & -COOH of
D-alanine
Gram positive peptidoglycan cross linking- Answer Peptide interbridge
Properties of bacterial membrane -Answer Ester linkage between glycerol
Fatty acid hydrocarbon
Bilayer membrane
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