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# Tutor profile: Laura L.

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Laura L.
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## Questions

### Subject:Geometry

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Question:

How to find the total angles in a polygon.

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Laura L.

To understand this well, it is easiest to breakdown the concept. In a triangle, its three angles will alway add up to equal 180 degrees. So to find the total degrees in any polygon, think of how many triangles the polygon can be divided into. To visualize, draw a square (a square is a polygon) and draw a diagonal line from one corner to another. You should be able to see this line creates two triangles. If we multiply 180 degrees (the total angle measure from one triangle) by 2 (the number of triangles in a square), we get 360 degrees, the total angle measure of a square. Now that you have the visualization, you don' need to see how many triangles fit in every shape. Use the formula: (n-2) x 180 = total angle measure. N in the equation is the number of sides the shape has. To put this into action use a square as a example shape in the formula. EX: (4-2) x 180 = 2 x 180 = 360

### Subject:Pre-Algebra

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Question:

What is a polynomial?

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Laura L.

The definition of a polynomial is a mathematical expression involving a sum of powers in one or more variables multiplied by coefficient. To clarify, coefficients are numbers in front of variables. So in 4x^2, the coefficient would be 4. Expressions are simply equations without a equal sign. Variables are letters or symbols that represent something else, such as another unknown number Using the same 4x^2 example, x would be the variable. Polynomials are again, expressions that involve only the operations of addition, subtraction, multiplication, and non-negative integer exponents.

### Subject:Biology

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Question:

* Describe specific mechanisms that allow eukaryotes to regulate gene expression – post-transcription through post-translational modification

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Laura L.

Specific mechanisms that allow eukaryotes to regulate gene expression post transcriptional factors are slicing, 5’- methyl cap, poly-a tail, RISC complex, post translational modification, and the ubiquitin and proteasome system. Slicing is when the introns are cut off of a RNA strand by the spliceosome which helps regulate gene expression. 5’- methoxy cap and the poly- a tail help with the export of mRNA while protecting it from dehydration. Additionally, the poly-a tail helps with transcript termination. The RISC complex rips the target RNA in half so the RNA strand can find its matching mRNA strand. Once found, the slicer slices up the matching rna strand. Then, these strands are floating around the cell so they are destroyed because they are not formed proteins. The ubiquitin and proteasome system tags and bags proteins so they can be recycled. The ubiquitin tags the proteins and the proteasome chops them up

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