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Tutor profile: Zack E.

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Zack E.
Resident Physician
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Questions

Subject: Chemistry

TutorMe
Question:

How many ml of 0.5M NaOH are needed to neutralize 200 ml of 2M H2SO4?

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Zack E.
Answer:

MaVa = MbVb Note: each mole of H2SO4 gives us two moles of H+, so double the concentration since its diprotic. (4M) (200ml) = (0.5)(X) Solve for X: X= 1,600 ml or 1.6 L

Subject: Psychology

TutorMe
Question:

In operant conditioning, what is it called when a stimulus is added to increase the likelihood of a behavior occurring again?

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Zack E.
Answer:

Positive reinforcement. Reinforcement occurs when an action or stimulus increases the likelihood of the behavior occurring again (vs. punishment which discourages the behavior from happening again). Positive refers to adding a stimulus, while negative refers to removing a stimulus.

Subject: Biology

TutorMe
Question:

If DNA is found to have 30% Guanosine in a eukaryotic organism, what percent of the DNA is Adenosine?

Inactive
Zack E.
Answer:

The DNA will be 20% Adenosine. Since Eukaryotic DNA is double stranded, it will follow Chargaffs rule, in which the quantity of base paired bases will have identical percentages. Thus is Guanosine is 30%, cytosine which is its base pair must also be 30% of the composition. This leaves the remaining 40% to be divided equally among Adenosine and Thymosine, 20% each.

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