An investigator wants to do a spread-plate to achieve a 10-5 dilition of the ori

Question

An investigator wants to do a spread-plate to achieve a 10-5 dilition of the original sample being plated Which of the following would be the O A 1 ml of a 1/10,000 dilution to the plate B 1 ml of a 1/100,000 dilution to the plate OC. 0 1 mL of B 1/10,000 dilution to the plate D 0 1 mL of a 1/1000 dilution to the plate E 0.1 ml of a 1/100,000 dilution to the plate QUESTION 12 You want to do a viable count on a water sample taken from a naturally cold arbic stream Which of the following would be the most inappopriate method to use? taken from a naturally cold aric stream Which of the following would be the most inappopriate A spread-plate B pour-plate C membrane filtration on agar D. MPN count E all of the above would be inappropriate QUESTION 13 You have done a Presence-Absence test for microorganisms in apple cider Your results show that growth occurred in the culture tubes h 1/10. 1/100 and 1/1,000 dilutions of the sample However no growth securred of organisms in the apple cider? in the 1/10 000 culture tube What do you know about the number A there are 1,000 cellis/mL of cider B there are at least 100 000 cells/mi of cider C there are between 1,000-10 000 cells/imt of cider D there are betwesn 100-1,000 cells/mL of cider bE you cannot make a decision since none of culture tubes were plate QUESTION 14

Explanation / Answer

11) Which of the following would be the correct operation in order to achieve his/her goal?

C) 0.1 ml of a 1/10,000 dilution to the plate

12) You want to do a variable count on a water sample taken from the naturally cold arctic stream. Which of the following would be the most inappropriate method to use?

C) Membrane filtration on agar

13) What do you know about the number of organisms in the apple cider?

D) There are between 100-1000 cells/ml of cider

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