2.5 points Save Answer Question 1 Suppose E. coli has a nitrogen to phosphorus r

Question

2.5 points Save Answer Question 1 Suppose E. coli has a nitrogen to phosphorus ratio of 3:1 (3 atoms of N for every atom of P). You are growing E. coli at 37 degrees C on minimal media that has an N:P ratio of 1:1. How should the growth rate respond if you add a new supply of N? 1.decrease 2. no change 3. increase 4.can't tell from information given 2.5 points Save Answer Question 2 How would the growth rate respond if you add a new supply of P? 1.no change 2.increase 3.can't tell from information given 4. decrease 0 2.5 points Save Answer Question 3 What would you expect the response to be if you increased the temperature of incubation by 25 degrees C? 1.can't tell from information given 2.no change 3. decrease 4. increase 2.5 points Save Answer Question 4 What would you expect the response of the growth rate be if the pH was increased by 2 units? 1.decrease 2.no change 3. increase 4. can't tell from information given 0

Explanation / Answer

For the question 1 and 2 it cant be predicted from the given information. The given information is not sufficient to predict the effect on bacterial growth. Hence the answers would be-

1. 4

2. 4

3. The growth will decrease if we increase the temperature. The optimim temperature for carrying out various physiological functions is 37 in E. coli., If we increse it then the enzyme's efficiency will be reduced. A change of 20 can result in bacterial death as well.

4. Change of pH by point two will result into drastic decrease in growth. Again pH is necessary for maintianing shape and 3D structures of enzymes. Change in ph will lead to various protonation and deprotonation events in proteins, which will disturb the ezyme structure and hence decrease in growth.

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