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Tutor profile: Daniela B.

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Daniela B.
Johns Hopkins University Molecular Biology Graduate
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Questions

Subject: Spanish

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Question:

Reorder the words below using DOUBLE OBJECT pronouns to answer the following question: ¿María Fernanda te mandó la carta? (ella, mando, sí, la, me)

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Daniela B.
Answer:

Sí, ella me la mando.

Subject: Organic Chemistry

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Question:

What is the difference between SN1 and SN2 reactions?

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Daniela B.
Answer:

SN2 is a concerted mechanism, meaning that the reaction occurs in one step. The barrier is steric hindrance, the reaction will only proceed if the empty orbital is accessible since it requires a backside attack. SN1 occurs in two steps, it needs a good leaving group, for it will leave first, creating a carbocation. The barrier is typically carbocation stability, which is why tertiary carbons are most favorable, followed by secondary. Once this positive charge is on the carbon, the nucleophile can attack.

Subject: Biochemistry

TutorMe
Question:

What is the mechanism of allosteric regulation of pyruvate kinase?

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Daniela B.
Answer:

Fructose 1,6 bisphosphate and PEP activates while citrate, ATP, and alanine inhibit pyruvate kinanse. ATP is an indicator of sufficient energy in the cell, inhibiting pyruvate kinase to slow the progression of glycolysis and avoid creating energy when the cell is energetically satisfied.

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