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Clarissa C.
Tutor for 3 years, Master's in Molecular Biology
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Chemistry
TutorMe
Question:

What Is an Acid?

Clarissa C.
Answer:

Put simply, an acid is any substance that has pH of less than 7. The pH scale is used to measure how acid or alkali a substance is: 0-3 = strong acid (UI turns red) 4-6 = weak acid (UI turns orange/yellow) 7 = neutral (UI turns green) 8-10 = weak alkali (UI turns blue) 11-14 = strong alkali (UI turns purple) The pH of an acid is determined by the concentration of Hydrogen ions (H+) the substance has when in solution. All acids contain hydrogen ions when in solution; the higher the concentration of H+ ions, the lower the pH.

Biology
TutorMe
Question:

What is hybridization in genetics?

Clarissa C.
Answer:

In genetics, hybridization is the cross-breeding of individuals from different “pure” lineages in relation to a given trait, that is, the cross-breeding of different homozygous individuals for the studied trait. In Mendel’s experiments with peas, for example, a plant from a green pea lineage obtained from the self-fertilization of its ancestors over several generations, was crossed (cross-fertilization) with another plant from a yellow lineage also obtained by self-fertilization of its ancestors. (The self-fertilization over several generations of ancestors and the exclusive obtainment of individuals with the desired characteristics ensured that the individuals of the parental generation were “pure”, or rather, homozygous for that characteristic.)

Algebra
TutorMe
Question:

Simplify: (3x^(2)y^(-2))^3 / (9xy^3)^3

Clarissa C.
Answer:

(1/27)(x(^3)) / y^(15))

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