Lab 7: Antimicrobial Agents (20 points) Answer the following questions: 1.List t

Question

Lab 7: Antimicrobial Agents (20 points)

Answer the following questions:

1.List the four substances (household reagents) that you are using for this experiment (1 point)?

a.

b.

c.

d.

2. State two hypotheses (or best guesses) about how your household reagents will affect the yeast. Specifically, state here:

A. Which of your household reagents do YOU THINK (or guess) will interfere MOST with the yeast’s activity to make foam (in other words, which will have the least foam)?

i)

ii)

B. Which of your household reagents do YOU THINK (or guess) will interfere the LEAST, or maybe even help the yeast grow? Note: There are no right or wrong hypotheses (2 points)!!

i)

ii)

3.Data chart to fill in (2 points):

If you made any inadvertent modifications to the procedure, make a note below the table – please indicate if you used a heating pad or not

Height

of foam after 60 mins

4. What is the purpose of the control glass (1 point)?

5.If the yeast was prevented from growing, what happened to the foam (1 point)?

6.Which substances were most effective in limiting the growth of yeast? Which substances did not limit the growth of yeast? How do you account for the differences in the amount of foam produced (2 point)?

7.Based on your data, explain whether either of the hypotheses are true? If so, which? (Note: It’s not better or worse if they were; it is just interesting to see how actual data can provide support for your guesses (1 point).

8.Write at least THREE questions that come from your results. (You may want to include things you don’t understand or that don’t make sense based on your data. 3 points)

a-

b-

c-

9.For this question, remember what the data mean: In general, more foam indicates yeast activity, and more yeast activity generally indicates more yeast.

a.Do you think the substances killed ALL the yeast in the containers (1 point)?

b.How could you test to see if any yeast survived in the experimental group (1 point)?

c.Why might some yeast survive and some die (1 point)?

10.Describe two ways in which this lab is related to other microbiology topics we’ve discussed so far or how this activity relates to your life (2 points)?

a-

b-

11. What are TWO factors that influence populations of microorganisms (2 points)?

a-

b-

Height of foam after 10 minutes Height of foam after 20 minutes Height of foam after 30 minutes

Height

of foam after 60 mins

Control Reagent#1 Reagent #2 Reagent #3 and Reagent #4

Explanation / Answer

dear student please give the information regarding your experiment.

on the basis of the limited information , i can try few of your questions.

and these are

question 2.

part A

i). sugar ,ii) starch rich substances like potato.

part B

i) baker's yeast ii) beer iii) ginger beer.

question 5.

less foam will be formed on preventing the growth of the yeast.

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