23. You are studying two different pathways in liver cells in the lab. One pathw

Question

23. You are studying two different pathways in liver cells in the lab. One pathway is activated by 0.SuM of signal X, and the other is activated by 0.SuM-0.7uM of signal Y. Which property differs between these pathways? A. Response timing. B. Persistence. C. Dynamic range D. Sensitivity E. Coordination. 24. How can PI3K affect the growth and survival of cells? A. It can respond to cytokines and stimulate cell survival. B. It can result in the release of inhibition of Bc12. C. It can respond to growth factor signaling and suppress growth. D. It triggers activation of executioner caspases. E. It causes increased expression of XIAP Kinesin and microtubule coordination are extremely important during mitosis. Which of the following statement correctly pairs the kinesin with the correct type of microtubule and important function? 5. A. Kinesin 5 binds to kinetochore microtubules to push the poles apart in anaphase B. B. Kinesin-14 associates with chromosomes and helps bring them to the middle for metaphase. C. Kinesin-14 binds to interpolar microtubules to pull poles together in metaphase. D. Dyneins associate with kinetochore microtubules to help pull the poles apart. E. None of the above

Explanation / Answer

Ans.23). Different pathways of the cells show are activated by different concentration of signals, which depends on the sensitivity of receptor molecules towards the signalling molecule.

Option D is given as sensitivity. Hence, the correct answer is option D. phosphorylate phosphatidylinositol-(4,5)-phosphate

Ans.24). PI3K signalling (phosphatidylinositol-3-kinase) is responsible for cytokine production from naive T-cells and it also inhibits apoptosis, thus promotes cell survival.

Option A is given as it can respond cytokines and stimulate cell survival. Hence, the correct answer is option A.

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