T3 and T4 thyroxin leads to negative feedback loop by inhibiting the TRH and TSH, but these negative feedback regulation is prevented in case of___ 

I- Hypothyroidism

II- Thyrotoxicosis 

III-TSH and I deficiency

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#Question id: 2242

#Unit 2. Cellular Organization

What two features of the structure of cholesterol make it somewhat amphipathic?

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#Question id: 4977

#Unit 11. Evolution and Behavior

There are at least a dozen known species in the extinct genus Lystrosaurus. If each species was suited to a quite different environment, then this relatively large number of species is likely due to

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#Question id: 18596

#Unit 11. Evolution and Behavior

First toothed birds appear in which geological time periods?

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#Question id: 12931

#Unit 13. Methods in Biology

Choose the incorrect statement about the Genome library.

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#Question id: 2452

#Unit 2. Cellular Organization

Intermediate filaments

a. are typically 6 nm in diameter.                  

b. are essential for cell motility.

c. may be used to diagnose the tissue of origin for many cancers.

d. are composed of globular subunits.                       

e. are formed from tetrameric subunits.