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Tutor profile: Miriam R.

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Miriam R.
Tutor with Chemistry Tutoring Experience
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Questions

Subject: MCAT

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Question:

A patient is asked to memorize a series of 10 words on a written list. Upon being asked to recount the list, they are able to remember items from the beginning and the end of the list, but none of the words in the middle. What does this illustrate? A. the serial-position effect B. chunking C. hindsight bias D. decay

Inactive
Miriam R.
Answer:

A. the serial-position effect This is one of the terms that you should know for MCAT, due to its relevance to psychology. Serial-position effect is the tendency of a person to recall the first and last items in a series better than the middle items.

Subject: Chemistry

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Question:

How many chloride ions are in a 10 L solution of 0.03 M MgCl2?

Inactive
Miriam R.
Answer:

$$ 3.61 * 10^{21}$$ Chloride ions Through some stoichiometry, we will cancel out the units we don't want until all that's left is the number of ions. Start with the volume of the solution. Multiple by the number of moles of the solution per unit volume. Now we have the number of moles of MgCl2. Multiply by the moles of chloride ions (2) per mole of this compound, which we know because of the subscript. Now we have the number of moles of Cl- (chloride ion). Next we multiply by avogadro's number, which is the number of molecules/ions per mole. $$( 10 \:L \:MgCl_2 )$$ * ( $$ \frac{0.03 \:mol \:MgCl_2 }{1 \:L \:MgCl_2} $$ ) * ( $$ \frac{2 \:mol \:Cl^-}{1 \:mol \:MgCl_2} $$ ) * ( $$ \frac{6.02 \:* 10 ^{23} \:ions \:Cl^-}{1 \:mol \:Cl^-} )$$ $$= \: 3.61 * 10^{21} \: ions \:Cl^-$$

Subject: Biology

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Question:

Which step(s) of human gene expression can be regulated?

Inactive
Miriam R.
Answer:

Many steps! To name some examples of regulation throughout the process: - DNA methylation results in a more closed chromatin, causing a decrease in transcription to mRNA. - Binding of miRNA to mRNA prevents the process of translation from occurring. - Post-translational modifications of proteins include phosphorylation, which can affect the protein's activity level.

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