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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!
Some wines are marketed as "sparkling" wines. Sparkling wines are considered so because of a dissolved gas that makes them fizzy. Concern what you know about the procedure of respiration to explain the type and origin of this gas.
How may this capacity be an advantage to the cell.
What disorder does this man have? Gastric secretions normally include about 10mmole/L potassium. How do you account for the low serum potassium in this patient.
Biochemical feedback regulation or end product inhibition. What are the most general neurotransmitters in the brain.
Forecast what would happen if the cytoplasm increased as the embryo cleaved. Explain why would this be a problem?
Purine biosynthesis is allowed to take place in the presence of [N15]aspartate, and the newly synthesized GTP and ATP are isolated. What positions are labeled in the two nucleotides.
An enzyme and its substrate are combined in a test tube but no product is formed. Another molecule is added to the tube, and now the product is formed at the normal rate. Give 2 reasons.what type of inhibition is working on the substrate.
When a fruit fly of genotype Mm Nn Oo is mated to another fly of identical genotypes, what proportion of the progeny flies will be MM nn Oo.
After falling into an abandoned well, a young boy is rescued after he nearly drowns. find the treatment to restore this body to homeostasis.
You are designing a new single-celled organism. Discuss the problems of size, getting molecules like nutrients and wastes in and out, temperature, energy and replication of genetic materials.
How do these duplications arise and what do they propose in terms of mechanisms of transposition. Could you help to understand FEV1/FVC and how the expected percentage of this figure relates to respiratory problems.
A 2.5 mg/ml stock solution was diluted as described in the table below and then the absorbance of each dilution was estimated and presented in the table given below.
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