Which of the following mutations would promote malignancy in cells whose proliferation is inhibited by TGFβ?

a. overexpression of Smad2               

b. loss of Smad 4

c. overexpression of TGFβ receptor I

d. loss of TGFβ receptor II

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#Question id: 7101

#Unit 5. Developmental Biology

What is the mechanism by which cells fated to be mesoderm form in the marginal zone of the Xenopus embryo?

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#Question id: 28640

#Unit 2. Cellular Organization

Which of the following kinase activate CDKs in all organism?

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#Question id: 12048

#Unit 7. System Physiology – Animal

A 10-year-old boy consumes a cheeseburger, fries, and chocolate shake. The meal stimulates the release of several gastrointestinal hormones. The presence of fat, carbohydrate, or protein in the duodenum stimulates the release of which of the following hormones from the duodenal mucosa?

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#Question id: 4691

#Unit 3. Fundamental Processes

Processing of pre-rRNA transcripts (30S)  in bacteria, after the modification and cleavage produces mature RNAs is

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#Question id: 30107

#Unit 1. Molecules and their Interaction Relevant to Biology

Major controls of de novo AMP synthesis include:

1. allosteric inhibition by GMP.

2. allosteric inhibition by AMP.

3. availability of PRPP.

4. stimulation by GTP.