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3) A friend of yours asks you to help him/her draw two bacterial growth curves. He/she gives you the following information: the TA started both cultures (one was labeled culture “X” and the other culture “Y”) at 8:30am using the same overnight culture to inoculate fresh medium. After inoculation of the medium the OD was 0.14 for both cultures and both cultures were incubated at 37 oC. During class the following OD readings were obtained: for culture “X”: 0.19 at 9:50am, 0.28 at 10:10am, 0.29 at 10:30, 0.68 at 10:50 am, and 1.1 at 11:10am. At 11:30am the OD of a 1:10 dilution of the stock culture was 0.29. For culture “Y”: 0.16 at 9:50am, 0.19 at 10:10am, 0.21 at 10:30, 0.24 at 10:50 am, 0.28 at 11:10am and 0.32 at 11:30am.A) Draw the two graphs. B) What was the generation time of these cultures? C) What could be the reason for the different growth pattern? Give a detailed explanation!
4) For a different experiment you are growing up Saccharomyces cerivisiae instead of E.coli. The measured OD is 0.89. A) In order to calculate the concentration of the Saccharomyces cerivisiae culture, can you use the equation that you use to calculate the concentration of an E.coli culture? If yes or no, give adetailed explanation. B) Does E.coli or Saccharomyces cerivisiae have a shorter generation time? Give a detailed explanation!
5) Your TA gives you an E.coli culture that has a concentration of 2000cells/ml. He/she tells you to evenly spread 25µl of this culture on an LB agar plate and another 25µl on a GMS plate. Both plates are incubated at 37oC. What do you expect to see the next day and why? Give a detailed explanation!
6) You want to determine what the optimal pH is for E.coli to grow. How would you set up the experiment? Give a detailed explanation!
Add 1 liter of blood to four liters of water, then take 1 ounce of that solution and add it to 9 ounces of water. at last , take 3 mls of that dilution and add it 567 mls of water.
If repressor tetramer uses only two of its subunits to bind to an operator sequence, why is tetramer formation so important to the control of lac operon gene expression.
After much persuasion, Vanessa has finally consented to go away for a romantic weekend at a seaside resort where Eric has promised to "teach her about sex." Vanessa is both increasingly anxious about the coming weekend and enjoying fantasies of being..
Changes in temperature and pH along with Substrate Concentration and Enzyme Concentration were the conditions tested in experiment. because warm water is less dense then cold water, would you predict any difference between spines of warm water indivi..
Why were there complaints then about night-blindness, bone demineralization, and blood-clotting problems. If they have a large family, in what ways have to the colorblindness trait affect their children.
Which will you expect to increase significantly from M to G1. What does this tell you about how the cellular information for eye colour is pass on? Describe in detail.
One hundred microliters of this pigment was dissolved in 5 mls acetone=call this A. 5 mls acetone was added to A=call this B. 5 more mls of actone was added to B= call this C and List the sensory receptors found in the dermis of the skin.
How do you find the concentration of a solution when given the info that the concentration of the stock solution is 1:57 and has a concentration of 5mg/ml.
Which pair will have been likely to agree that strata such as those depicted here were deposited gradually over long periods of time by subtle mechanisms that are still at work?
Industrial melanism refers to the dark pigmentation that evolved in some insects giving them protective coloration on vegetation darkened by soot in heavily industrialized areas prior to air pollution regulation.
He speculated that geologic columns would have the most height of 72,000 feet. Using his approach and numbers, compute the approximate age of the earth he came to.
Indicate how the landfill under construction will be superior to the old landfill for each difference. Plan a new product. "Build" your new product.
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