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  7. Unit 1 BIOL1 - Biology and disease (BIOLOGY)

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Summary Molecules to Microbe
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  • May 26, 2021
  • 2
  • 2020/2021
  • Summary

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a. Teichoic acids

Week 20

The specific growth rate, μ, is given as:

a. The time taken to go from lag to stationary phase.
b. The number of divisions per h.
c. The time taken for the number of cells to double.
d. A common value for all bacteria growing in a complex medium.

The final cell density of a bacterial culture is affected by all of the following EXCEPT:

a. The number of cells initially inoculated into the culture vessel.
b. The temperature of incubation.
c. The pH of the medium.
d. The composition of the growth medium.

Which statement best characterises the process of fermentation?

a. It uses oxygen as an electron acceptor.
b. It uses less oxidising substances such as sulfate and nitrate as electron acceptos.
c. Releases energy from a sugar or other organic molecule, does not require oxygen or an
electron transport system.
d. Fermentation can proceed using all three of the above mechanisms.

In what pH range do neutrophiles grow?

a. Around neutral pH.
b. In alkaline environments.
c. In acid environments.
d. Across a broad range of pHs.

The temperature growth range for mesopliles is

a. 20-10°C
b. Around 100°C
c. 20-45°C
d. 45-70°C

What component of Mannitol Salt Agar SELECTS for S. aureus and S. epidermidis in clinical samples?

a. High salt concentration.
b. Mannitol and phenol red.
c. Glucose.
d. Agar

Which energy and carbon sources do photoheterotrophs use?

a. Organic compounds for both.
b. Light and organic compounds
c. Light and carbon dioxide.
d. Inorganic compounds and carbon dioxide.

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