33. Paracrine signals: A. Act on cells distant from the cell they are rel B. Are

Question

33. Paracrine signals: A. Act on cells distant from the cell they are rel B. Are released by neurons C. Act on cells near to the cells they are released from. D. Are hormones 4pbe tervid hormones A. Are released by neurons B. Bind to intracellular receptors and regulate transcription C. Bind to and activate kinase receptors on the surface of cells D. Bind to receptors bound to the nuclear membrane 35. GEF proteins: A. Inhibit G protein activation by promoting GDP binding B. Activate G proteins by promoting GTP binding C. Promote GTP hydrolysis 36. During the Gl phase of the cell cycle: A. DNA synthesis occurs B. Cells prepare for replication C. Cells are undergoing growth and metabolism D. Cells cease to re-enter the cell cycle 37. M cyclin: A. Regulates the transition to M phase B. Regulates the transition to S phase C. Prevents entry into M phase D. Both A and B 38. p53 is activated in cells with damaged DNA. P53 triggers a series of events that: A. Repairs DNA before cell cycle proceeds B. Prevents cell entry into S phase C. Produces more cyclins D. Triggers cell entry into S phase 39. A cdk that triggers entry into S phase is likely to: A. Initiate mitosis B. Initiate cell growth C. Inhibit cyclin activity D. Initiate DNA synthesis 40. Microtubules grow: When tubulin is bound to GTP. A. B. When tubulin hydrolyzes GTP C. When tubulin is bound to GDP D. When tubulin is degraded

Explanation / Answer

33. Paracrine signals : (c) act on cells near to the cells they are released from.

34. Hydrophobic steriods hormones : (d) bind to receptors bound to the nuclaer membrane.

35. GEF proteins : (b) are proteins or protein domains that activate monomeric GTPases by stimulating the release of guanosine diphosphate (GDP) to allow binding of guanosine triphosphate (GTP).

36. During the G1 phase of the cell cycle : (b) cells prepare for DNA replication.

37.

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