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# Tutor profile: Jennifer M.

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Jennifer M.
Biology and chemistry tutor and microbiologist
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## Questions

### Subject:Chemistry

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Question:

Explain the difference between oxidation and reduction.

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Jennifer M.

Oxidation involves a chemical process where a molecule, atom or ion looses an electron. Reduction involves a chemical process where a molecule, atom, or ion gains an electron. Remember OIL vs RIG: Oxidation is loss of electrons and reduction is gain of electrons.

### Subject:Biology

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Question:

Why do Gram positive bacteria stain differently than Gram negative bacteria?

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Jennifer M.

Gram negative bacteria have a thin peptidoglycan wall, and Gram positive bacteria have a very thick peptidoglycan wall. When the bacteria are decolorized, the Gram positive bacteria will retain the crystal violet color, and will remain purple. The Gram negative bacteria will lose the crystal violet color and absorb the pink Safranin color.

### Subject:Algebra

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Question:

If a car is traveling 60 miles per hour at a constant rate, how many minutes will it take to travel 80 miles?

Inactive
Jennifer M.

60 minutes =1 hour 60 miles/60 minutes = 80 miles/x minutes = 60 minutes*80 miles =60x 4,800 = 60x 4800/60 = x x=80 minutes This is a rate question. The car is traveling a distance per an amount of time (distance/time) We know how fast the car is driving-the speed- which is distance/time and we know how long the trip will take. We are looking for time. So set up an "if, then..." scenario. distance/time =distance/time. Fill in the known variables and solve for the unknown variable.

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