Hi, I need help with the last 3 questions on my homework. Thank you! 6) What is

Question

Hi, I need help with the last 3 questions on my homework. Thank you!

6) What is the reasoning behind finding SAME COLONY of bacteria but DIFFERENT SIZES (not shapes) on your agar plate from lab 1?

7) When describing a bacterial colony growing on an agar plate, the elevation of the colony is one of the traits that can be noted. What is the term used to describe a colony that has this sort of elevation profile?

A. raised          B. pulvinate          C. craterform          D. convex           E.      umbonate

8) Correctly sketch and label a picture of how agar plates should be returned to   the tray for incubation? Correct drawing (1 point); Correct label of agar side and lid.

Explanation / Answer

6.stress conditions reduce the growth rate of the bacteria. and high salinity result osmotic pressure and water flows outside of the cell and cells tend to shrink.Some concentrations of salts produce stress in bacteria and this affects the shape and growth of the bacteria. Osmotic shock affects cell wall synthesis and membrane.These factors may cause different sizes of bacterial colony on the agar plate.

7d. convex form.

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