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Tutor profile: Chrissie R.

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Chrissie R.
Tutor and environmental scientist
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Questions

Subject: Writing

TutorMe
Question:

When is it appropriate to use a semicolon in writing?

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Chrissie R.
Answer:

It is appropriate to use a semicolon when you are joining two or more ideas in a sentence that are given equal position or rank. They are used between two independent clauses that are connected by conjunctive adverbs or transitional phrases.

Subject: Earth Science

TutorMe
Question:

What period in Earth's history is largely responsible for our coal supply?

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Chrissie R.
Answer:

The period of earth largely responsible for our coal supply is the carboniferous period which took place during the Paleozoic era.

Subject: Biology

TutorMe
Question:

Why is DNA polymerase used in polymerase chain reactions (PCR) used from a thermophillic microbe such as Thermus Aquaticus?

Inactive
Chrissie R.
Answer:

Thermophiles such as Thermus Aquaticus, which have been recovered from geysers in Yellowstone National Park, have Taq DNA polymerase that remains stable at very high temperatures, which is needed when DNA is heated and cooled repetitively during the process of PCR and will not denature.

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