Cell Biology and Micro-biology

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1. The base adenine (A) of the DNA of the bacterium Salmonella enterica forms 23.9% of its composition. which of the following is most likely the base composition of the genome given C is cytosine, G is guanine and T is thymine?

  • C=23.9% G=26.1% and T=26.1%
  • C=23.9% G=23.9% and T=23.9%
  • C=26.1% G=26.1% and T=23.9%
  • C=26.1% G=26.1% and T=26.1%
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2. Many of the proteins in the bacterial flagellum show homology with the proteins of which of the following structures?

  • Capsule
  • Type three secretion system
  • Ribosomes
  • Pili

3. Which of the following bacterial species would you expect to have the thickest peptidoglycan layer?

  • Staphylococcus aureus
  • Chlamydia trachomatis
  • Escherichia coli
  • Mycoplasma pneumoniae

4. Which of the following best describes a chemolithotropic organism?

  • An organism which obtains energy from the oxidation of inorganic chemicals
  • An organism which obtains energy from the oxidation of organic chemicals
  • An organism which obtains energy from light driven reactions
  • An organism which obtains energy from the oxidation of sugars

5. the term used to describe flagella distributed across the entire surface of a bacterial cell is called what?

  • peritrichous
  • amphitrichous
  • lopotrichous
  • monotrichous

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