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Tutor profile: Chao Z.

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Chao Z.
Experienced Tutor in Biology, Chemistry, and Environmental Sciences
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Questions

Subject: Environmental Science

TutorMe
Question:

The Mohs hardness scale measures:

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Chao Z.
Answer:

the ability of harder material to scratch softer materials, thereby characterizing scratch resistance.

Subject: Biology

TutorMe
Question:

The stop codons for mRNA are UAG, UAA, and UGA. What are the corresponding codons for DNA?

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Chao Z.
Answer:

The corresponding condons for DNA are TAG, TAA, and TGA. In DNA, Uracil is replaced by Thymine at the corresponding base pair.

Subject: Dentistry and Pre-Dentistry

TutorMe
Question:

A patient presents with tooth pain. Upon clinical examination, tooth #19 shows a large carious lesion encroaching on pulp. There is no swelling. Radiographic examination shows a periapical radiolucency. #19 showed no response to cold, and exaggerated response to percussion and palpation. What are the pulpal and periapical diagnoses for #19?

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Chao Z.
Answer:

Since #19 is negative to cold, the nerve has died and hence, the pulpal diagnosis is pulp necrosis Due to presence of a periapical radioluency as well as exaggerated response to percussion and palpation, the periapical diagnosis is symptomatic apical periodontitis.

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