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# Tutor profile: Viviane L.

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Viviane L.
Incoming Medical Student at Johns Hopkins University
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## Questions

### Subject:MCAT

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Question:

If you observed a red blood cell in the left ventricle, you would find that... a. The red blood cell is ready to move to the left atrium b. The red blood cell's hemoglobin is fully saturated with oxygen c. The red blood cell is ready to move through the pulmonary valve d. The red blood cell's hemoglobin is fully saturated with carbon dioxide e. The red blood cell's hemoglobin has one oxygen molecule bound

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Viviane L.

b. the red blood cell's hemoglobin is fully saturated with oxygen. The red blood cell would have already passed through the left atrium to be in the left ventricle and would be fully oxygenated, ready to be moved into the aorta through the bicuspid(aortic) valve.

### Subject:Chemistry

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Question:

The following expression is the solution to a problem. Calculate the answer and give the correct units, then formulate a problem that this expression could be a solution to. (3x10^8 m/s)(6.626x10^-34 Js) / (3.72x10^-19 J)

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Viviane L.

5.34x10^-7 m or 534nm. If a photon has an energy of 3.72x10^-19 J, what is its wavelength?

### Subject:Biology

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Question:

A student in a research lab runs a gel electrophoresis using DNA samples directly extracted from mouse livers. The student added ethidium bromide in with the agarose for visualization. When the gel is finished running, the student can clearly see the ladder under UV light, but the bands for the samples are very faint. What explanations could there be for why the student's sample bands are so faint?

Inactive
Viviane L.

Considering the ladder can be seen clearly, the gel was most likely run properly with the electrodes correctly attached and enough ethidium bromide added in. The problem, then, must be with the samples. It is possible that the student did not pipette a sufficient amount of sample into each well, resulting in low DNA quantity and ultimately less ethidium bromide intercalating and fluorescing in each sample. It is also possible that the DNA was improperly extracted from the mouse liver and of very low concentration, again resulting in low DNA quantity despite proper pipetting into the wells.

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