The three eukaryotic RNA polymerases can be distinguished by

a. the types of genes they transcribe.

b. the number and types of large subunits.

c. their differential sensitivities to cycloheximide.

d. their differential sensitivities to α-amanitin.

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#Question id: 1634

#Unit 4. Cell Communication and Cell Signaling

What is the main reason an experimental animal treated with X-rays can act as a living test tube for lymphocyte transfer experiments?

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#Question id: 8908

#Unit 9. Diversity of Life Forms

According to one hypothesis, the jaws of vertebrates were derived by the modification of

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#Question id: 1812

#Unit 4. Cell Communication and Cell Signaling

What is the percentage of γδ T-cells bearing Vγ9, Vδ2 T-cell receptors in human adult peripheral blood?

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#Question id: 973

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the source of the atoms 5 and 7 during de novo biosynthesis of purines?

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#Question id: 5130

#Unit 5. Developmental Biology

Regulation by gradients of paracrine factor concentration was elegantly demonstrated by the specification of different mesodermal cell types in the frog Xenopus laevis by activin, a paracrine factor of the TGF-beta family. Which of the following observations are correct from this graph?