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Tutor profile: Haley C.

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Haley C.
Graduate Student in Medical Sciences
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Questions

Subject: Basic Math

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Question:

1/2 * 2/3 + (17-22) = ?

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Haley C.
Answer:

We need to remember PEMDAS - parenthesis, exponents, multiplication and division (left to right), addition and subtraction (left to right). 1//2*2/3 + (17-22) = ? 1/2 * 2/3 + (-5) = ? Now, we need to figure out how to multiply fractions. We will multiply the top numbers, and then the bottom numbers to start. (1*2) / (2*3) = 2/6 which can be reduced to 1/3 Now we have 1/3 - 5 = ? This can be hard to conceptualize because of the fraction and negative number, but if we rearrange the equation, we can make it easier to think about. -1 * (5-1/3) = ? We will simply multiple our answer by -1 in order to remove the confusion. Next, we have to subtract a fraction from a whole number, which can be challenging. We know that 1/3 is less than 1, so let's try it this way. -1 * (4 + (3/3-1/3) = ? because 3/3 = 1 +4 = 5 -1 * (4 + 2/3) = ? -1 * (4 and 2/3) -4 and 2/3 is our answer!

Subject: Chemistry

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Question:

If in the reaction A + B <--> C + D, we increase the concentration of A significantly, what will happen to the reaction?

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Haley C.
Answer:

This question focuses on Le Chatelier's Principle. The reaction is being stressed by increasing the concentration of substrate A, and thus the reaction will try to shift back to equilibrium by using up this extra concentration. The reaction will thus favor products C + D in response to an increase in the concentration of substrate A. If we instead reduced the concentration of substrate A, the reaction would shift in the opposite direction and favor the reactants A + B.

Subject: Biochemistry

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Question:

Compare and contrast the structure-function relationships of myoglobin vs hemoglobin.

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Haley C.
Answer:

Myoglobin is a storage protein in the cytosol of cells, whereas the function of hemoglobin is to transport oxygen from the lungs to the tissues. Myoglobin is able to bind oxygen with greater affinity than hemoglobin, allowing for the transfer of oxygen to cytosol storage. It will demonstrate Michaelis-Menten substrate saturation behavior where at some point every available myoglobin is bound to an oxygen and thus is "saturated" Hemoglobin, on the other hand, demonstrates a sigmoidal "S" shape curve that indicates cooperativity. The main structural difference between myoglobin and hemoglobin is the number of subunits - myoglobin is a single polypeptide chain whereas hemoglobin consists of 4 subunits. "Cooperativity" means that as hemoglobin binds oxygen, it develops greater affinity to bind the next oxygen. For this reason, hemoglobin is often found either fully bound to 4 oxygen, or bound to none.

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