# Tutor profile: Rebecca A.

## Questions

### Subject: Chemistry

If 5.0 moles of O2 and 3.0 moles of N2 are placed in a 30.0 L tank at a temperature of 250 ºC, what will the pressure of the resulting mixture of gases be?

6.5 atm

### Subject: Biochemistry

Describe the function of the glycogen branching enzyme.

This enzyme breaks a glycosidic linkage in a glycogen chain at least 11 monomers long producing a chain of 7 residues in length. It then catalyzes the formation of an alpha-1-6 linkage between the 7 residue chain and the pre-existing chain. this forms a new branch point at least 4 residues away from the previous branch site. This is done using the reducing end of the fragment.

### Subject: Algebra

Solve the following equation by completing the square: x^2 + 8x = -12

Answer: x= -2, 2 Work: x^2 + 8x = -12 x^2 + 8x + 16 = -12 +16 (x+4)^2 = 4 x+4 = 2 or x+4= -2 x= -2, 2

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