Practice Questions

TLS Online TPP Program

#Question id: 2677

Why is the transcription of structural genes of the trp operon turned off in the presence of tryptophan?

#SCPH05 I Biotechnology

Tryptophan is the repressor that binds to the operator, preventing transcription.
The structural genes are used to make tryptophan, which would not be needed if tryptophan is available.
Tryptophan has no effect on the transcription of the structural genes.
Tryptophan RNA polymerase from finding the promoter of the trp operon, preventing structural gene transcription.

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TLS Online TPP Program

#Question id: 2349

#SCPH28 | Zoology

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TLS Online TPP Program

#Question id: 2350

#SCPH28 | Zoology

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TLS Online TPP Program

#Question id: 2351

#SCPH28 | Zoology

A ______ electron microscope provides a three-dimensional view of the surface of an object.

TLS Online TPP Program

#Question id: 2352

#SCPH28 | Zoology

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TLS Online TPP Program

#Question id: 2353

#SCPH28 | Zoology

What portion of the outer plasma membrane is believed to account for characteristics such as blood type?

TLS Online TPP Program

#Question id: 2354

#SCPH28 | Zoology

Lipid-soluble molecules pass through the plasma membrane by _