Open Question: A student determines the isoelectric point ...?
A student determines the isoelectric point (the pH corresponding to zero net
charge) of a protein in an aqueous solution by lowering the pH until
precipitation of the protein is observed. During this process, the student
records an initial pH of 6.25 (protein is in solution), then upon addition of
acid, the pH decreases to 5.75 and the protein is found to have precipitated
from solution. The student should record the isoelectric point of the protein
as:
charge) of a protein in an aqueous solution by lowering the pH until
precipitation of the protein is observed. During this process, the student
records an initial pH of 6.25 (protein is in solution), then upon addition of
acid, the pH decreases to 5.75 and the protein is found to have precipitated
from solution. The student should record the isoelectric point of the protein
as:
a. 6.00 ± 0.50
b. 6.00 ± 0.25
c. 5.75 ± 0.50
d. 6.25 ± 0.25
e. 5.75 ± 0.25
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Open Question: STATS: A test consists of 10 true or false questions. To pass the test a student must get 70% or better on the?
To pass, the student must get 7 or more correct.
Out of 2^10 = 1024 possible outcomes:
There is 10C0 = 1 outcome where the student gets 10 correct.
There are 10C1 = 10 outcomes where the student gets exactly 9 correct.
There are 10C2 = 45 outcomes where the student gets exactly 8 correct.
There are 10C3 = 120 outcomes where the student gets exactly 7 correct.
This means there are 1+10+45+120 = 176 passing outcomes.
176/1024 = 17.1875%
20:13 |
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