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Tutor profile: Ali P.

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Ali P.
Tutor for Chemistry and Mathematics
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Questions

Subject: Biochemistry

TutorMe
Question:

What is the identity of the stationary phase in a cation exchange chromatography?

Inactive
Ali P.
Answer:

Cation exchange chromatography has a negatively charged resin as the stationary phase to allow negatively charged species to elute first.

Subject: Calculus

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Question:

What is the purpose of finding a first and second derivative of a function?

Inactive
Ali P.
Answer:

The first derivative can be used to find the critical points while the second derivative can be used to ascertain if the critical point is a minima or a maxima.

Subject: Biology

TutorMe
Question:

What is the most important stabilizing interaction for a DNA helix?

Inactive
Ali P.
Answer:

Contrary to popular belief, stacking is more important than interstrand hydrogen bonding. If you were to place two single strands on DNA is an aqueous solution, the stacking interaction can overcome the energy required to break the hydrogen bonding of the nitrogenous bases with the water molecules. In essence, base base stacking is very important to helix stability.

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