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# Tutor profile: Alexandra F.

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Alexandra F.
PhD Student and Instructor with 5 + years of experience in Science, Math, Writing
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## Questions

### Subject:SAT

TutorMe
Question:

What is exponential growth and how can I learn to easily identify it on a graph?

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Alexandra F.

Exponential growth is is when growth increases by a constant proportion over time. For example let's say we have a bacterial colony that undergoes exponential growth. We know that every hour, the bacterial population doubles. We begin with 10 bacteria at time 0, have 20 bacteria in one hour, 40 in two hours, 80 in 3 hours, 160 in 4 hours, and 2,560 after 8 hours! The shape of an exponential curve will always look like the letter J. It will start out flat, then increase sharply.

### Subject:Biology

TutorMe
Question:

What are amino acids and what is the difference between amino acids, polypeptides, and proteins?

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Alexandra F.

Amino acids are the basic building blocks of proteins, which are tiny machines that operate within cells. In increasing order of complexity we have amino acids, followed by polypeptides, followed by proteins. If you take a close look at any one protein, you will see that it is made up of strings that have been folded together into a unique shape. Each of these unfolded strings is called polypeptide. If you look closely at this polypeptide, you will see that it is made up of individual pieces that have been strung together to make that string. Each of these pieces is called an amino acid. An easy visualization of amino acids, polypeptides, and proteins can be done using beads on a string.

### Subject:Algebra

TutorMe
Question:

How can I remember the order of operations, so that I can remember it when I need it?

Inactive
Alexandra F.

Just remember the acronym "Please Excuse My Dear Aunt Sally." The first letter of each word stands for the operation, so if you write them out in order you get: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.

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