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Tutor profile: Mychael T.

Mychael T.
Preparing for dental school

Questions

Subject: Organic Chemistry

TutorMe
Question:

What are the two Bronsted-Lowry bases in the following equilibrium? CH3NH2 + H2O ⇌ CH3NH3+ + OH-

Mychael T.
Answer:

Bronsted-Lowry bases are substances that accept protons (H+), while a Bronsted-Lowry acid donates protons. Since CH3NH2 takes on an H+ to make CH3NH3+, it must be a Bronsted-Lowry base. We can't forget that equilibriums proceed in both directions, so there must be another Bronsted-Lowry base. On the right side we have an OH- and on the left side we have H2O. OH has a negative charge and one less H than H2O, meaning that an H+ must have been added to OH-. Since OH- accepted an H+, OH- is our other Bronsted-Lowry base. Answer: CH3NH2 & OH-

Subject: DAT

TutorMe
Question:

What are some strategies for improving my score on the reading comprehension section of the DAT?

Mychael T.
Answer:

The reading comprehension section of the DAT has 50 questions in total, and you are given 60 minutes to complete the section. There are multiple passages, each containing about 16 questions (some more than others). This means that you're not given a lot of time (especially when you're feeling the pressure of the test), which is why time management strategies are crucial. If there are 3 passages, and you spend 8 min reading those passages, then that only leaves you with 43 seconds to answer each question. You'll most likely have to refer back to the passage several times to search for answers. To help organize the passage and make searching for the answers more efficient, you should use the highlight tool they provide you on the test to highlight important phrases or words in each paragraph. Lastly, to ensure that these strategies work, we should practice them with a timer.

Subject: Biology

TutorMe
Question:

Assume a population is in Hardy-Weinberg equilibrium. If 36% of the population has a homozygous dominant genotype for a gene, what is the recessive allele frequency for that gene in the whole population?

Mychael T.
Answer:

Since we know that the population is in Hardy-Weinberg equilibrium, we know that the population follows the Hardy-Weinberg principle: p^2 + 2pq + q^2 = 1 where p^2 = dominant homozygous frequency (AA) 2pq = heterozygous frequency (Aa) q^2 = recessive homozygous frequency (aa) and we also have the equation for allele frequency: p + q = 1 where p = dominant allele frequency q = recessive allele frequency Since 36% of the population is homozygous dominant: p^2 = 0.36 Solving for p we get 0.6 Now that we solved for the dominant allele p, we can now plug it into our allele frequency equation to solve for the recessive allele frequency: p + q = 1 0.6 + q = 1 q = 0.4 The recessive allele frequency in this population is 0.4

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