#Question id: 1259
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to the phosphoinositide pathway.
A. many activated RTKs and cytokine receptors initiate phosphoinositide pathway by recruiting the enzyme phosphatidylinositol-3 kinase (PI-3 kinase) to the membrane.
B. PI-3 kinase adds a phosphate to the 3′ carbon in one of two separate phosphatidylinositol substrates, leading to formation of two phosphatidylinositol 3-phosphates: PI(3,4)P2 or I(3,4,5)P3
C. PI-3 kinase pathway can trigger cell division and prevent apoptosis, thus ensuring cell survival by the activation of PKB.
D. Activated PKB phosphorylates FOXO3a, which induces the expression of several antiapoptotic genes.
Which of the following combination is correct?
#Question id: 18899
#Unit 13. Methods in Biology
#Question id: 8938
#Unit 9. Diversity of Life Forms
#Question id: 11941
#Unit 7. System Physiology – Animal
Under conditions of normal renal function, which of the following is true of the concentration of urea in tubular fluid at the end of the proximal tubule?
#Question id: 13182
#Unit 10. Ecological Principles
The MacArthur-Wilson equilibrium model of island biogeography predicts the number of species found on islands. The figure below depicts two volcanic islands located off a section of mainland coast.
The MacArthur-Wilson model predicts that the relative numbers of bird species on the mainland and two islands would be