Why do fluorescence spectrometers often use double-beam optics?

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Question: Why do fluorescence spectrometers often use double-beam optics?
[A].

So a reference solution can be used

[B].

To compensate for beam attenuation by the monochromator

[C].

To compensate for power fluctuations in the radiation source

[D].

All of the above

Answer: Option C

Explanation:

No answer description available for this question.

In the intersystem crossing

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Question: In the intersystem crossing
[A].

the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)

[B].

a molecule converts its excess energy to light, and emits a photon

[C].

a molecule converts excess electronic energy to vibrational energy

[D].

all of the above

Answer: Option A

Explanation:

No answer description available for this question.

Internal conversion is where

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Question: Internal conversion is where
[A].

the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)

[B].

A molecule converts its excess energy to light, and emits a photon

[C].

A molecule converts excess electronic energy to vibrational energy

[D].

none of the above

Answer: Option C

Explanation:

No answer description available for this question.

Fluorescence occurs when

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Question: Fluorescence occurs when
[A].

a molecule returns to the electronic ground state from an excited triplet state by losing it’s excess energy as a photon

[B].

a molecule returns to the electronic ground state from an excited singlet state by losing it’s excess energy as a photon

[C].

a molecule lowers its vibrational energy by losing it’s excess energy as a photon

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

The binding of lac repressor to DNA could be considered to be analogous to

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Question: The binding of lac repressor to DNA could be considered to be analogous to
[A].

competitive inhibition of an enzyme

[B].

mixed-type inhibition of an enzyme

[C].

uncompetitive inhibition of an enzyme

[D].

allosteric effects in enzyme regulation

Answer: Option A

Explanation:

No answer description available for this question.

In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is

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Question: In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is
[A].

RNA polymerase I

[B].

RNA polymerase II

[C].

RNA polymerase III

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.