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Tutor profile: Isaiah B.

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Isaiah B.
B.S. Biology, University of San Diego
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Questions

Subject: Basic Chemistry

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Question:

Explain what valence electrons are, and their importance.

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Isaiah B.
Answer:

Valence electrons are incredibly important, as they heavily influence the behavior of the entire atom. Valence electrons are the outermost electrons on an atom. These electrons play key roles in determining the atom's electronegativity, electron affinity, and ionization energy.

Subject: Biology

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Question:

Explain why a change in a single nucleotide in a codon may not cause a change in the resulting amino acid.

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Isaiah B.
Answer:

Our genetic code is redundant in some cases. Some amino acids, formed from codons (a sequence of 3 nucleotides), can have multiple codons as their source of origin. For example, GUU forms the amino acid Valine, if we were to change the 3rd nucleotide (U) to C, our new codon would read GUC. When looking at a codon wheel, we can see that both GUU and GUC form Valine.

Subject: Agricultural Science

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Question:

How may the interaction between soil pH levels and soil microbiota affect plant growth?

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Isaiah B.
Answer:

Well, beneficial soil bacteria may have an highly preferred soil pH level, and when the soil pH is either lowered or increased, the sensitive bacteria may be at risk. When the soil bacteria are at risk of not being able to survive in this new environment, they will cease to provide the essential nutrients to the plant, thus the plant suffers. For example, bacteria that change and release nitrogen from broken down organic matter function best in soil pH range of 5.5 to 7.0. If I lower the soil pH to 1.0, the bacteria will no longer survive, and the crucial nitrogen will no longer be used properly.

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