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Tutor profile: Zachary E.

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Zachary E.
Fourth Year Medical Student - Upstate Medical University
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Questions

Subject: Chemistry

TutorMe
Question:

What formula can be used to determine the pH in buffered chemical solutions?

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Zachary E.
Answer:

The Henderson-Hasselbach formula, pH=pKa + log [A-/HA]. This formula can help solve for pH, pKa, A-, or HA when the remaining values within a buffered solution are known.

Subject: Biochemistry

TutorMe
Question:

What are the three positively charged amino acids at a neutral pH?

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Zachary E.
Answer:

Lysine, Arginine, and Histidine.

Subject: Biology

TutorMe
Question:

In biology, what does Chargaff's rule state, and what is its application?

Inactive
Zachary E.
Answer:

Chargaff's rule states that there is a 1:1 ratio of purine in pyrimidine bases in double stranded DNA. It's application means that when the percentage of one purine is known (say adenine), the exact same percentage will apply to the other purine (guanine).

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