# Tutor profile: Jamie M.

## Questions

### Subject: Chemistry

What is an acid?

While this may seem like a simple question, it actually is quite complex and it comes down to whose definition you choose. Arrhenius: An acid increases the H+ concentration when added to water. This limits us and excludes some things that we typically do consider acids. Bronsted-Lowery: An acid is a proton donor. This is a little broader of a definition, since it allows for acids to be things that do not contain a H+ to donate. Lewis: An acid is an electron pair acceptor. This allows for things to be defined as acids even when there is no proton transfer. This definition, while the broadest, is not the most common definition. For the most part the Bronsted-Lowery (also just called Bronsted) is the most commonly used definition of an acid.

### Subject: Biology

What are the functions of the endoplasmic reticulum?

The endoplasmic reticulum (also called ER) has two parts. The rough ER (RER), is called such because it is covered in ribosomes, as revealed by electron microscopes. The ribosomes aide in the function of the RER, which is protein production and processing (which includes modification and folding of the newly made proteins). The smooth ER (SER) has no ribosomes on its surface, which is why it is called smooth. It functions in the production of lipids, storage of calcium, and detoxification of the cell.

### Subject: Algebra

What is the slope of the line with the equation: 4x+2y=8?

The equation is given in standard form. We can solve it in one of two ways: 1. Change the equation to slope-intercept form. 2y=-4x+8 y=-2x+8 answer: -2 is the slope. OR 2. There is a formula that says the slope of a line can be given by the equation m=-a/b where m=slope, a=coefficient of x, and b=coefficient of y. This formula only works if the equation is in standard form. Since our equation is in standard form, our answer is m=-4/2, or m=-2

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