# Tutor profile: Ashley S.

## Questions

### Subject: Chemistry

In straight-chain organic molecules, cis-trans isomerism is a possibility only if the molecule contains at least one ____.

Cis-trans isomerism can only occur when there is a rigid bond because only then is it important to note what atoms are on top or bottom of the molecule. Also, this "top or bottom" notation is only relevant when there are two molecules bonded to carbon (besides the other carbon) which is not possible in a triple bond. Therefore the answer is a carbon-carbon double bond.

### Subject: Biology

List three main differences between prokaryotic and eukaryotic cells.

Eukaryotic cells have a membrane bound nucleus where genetic information is stored while there is no membrane-bound region in prokaryotic cells. Prokaryotic DNA is generally a circular plasmid while the DNA of eukaryotic cells is linear. Prokaryotic cells have no membrane-bound organelles, unlike the mitochondira or endoplasmic reticulium of eukaryotic cells.

### Subject: Algebra

Mia is a sales associate at an art gallery. Each week she earns $300 plus a 4% commission on all her sales. This week she earned $327. How much were Mia’s art sales this week?

We know that she earns $300 regardless of how much she sells, so to find out how much she sold, we need to focus on her commission, which is $27. Now, we also know that she earns 4% of her sales in commission. In this case, we can replace "of" with multiplication, giving us this equation: S x 0.04 = 27 where S is her total sales and 0.04 is the decimal form of 4%. Solving this, we find that her total sales were $675.

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