27-IP3 binds calcium channel on a. plasma membranes b. intracellular membranes.

Question

27-IP3 binds calcium channel on a. plasma membranes b. intracellular membranes. d. ER membranes. e. lysosomes 28- The nitric oxide (NO) receptor is a. A GPCR b. An RTK c. A Nuclear receptor d. A Membrane bound enzyme e. A Cytosolic enzyme 29. You have recently identified a molecule that you believe to be a ligand associated with a signal transduction mechanism. All you know about this ligand is that chemically it is hydrophilic. As a result, you expect it to interact with its receptor a on the extracellular side of the plasma membrane. b. within the cytoplasm of the cell. c. within the nucleus of the cell. d. on the cytoplasmic side of the plasma membrane. e. all of the above 30- The commitment of the cell to divide happens during the phase of the cell cycle a. M b. Go c. G d. G 31. The partitioning of cellular components happens during the phase of the cell cycle a. M b. G c. G d. G 32-DNA replication happens during the phase of the cell cycle a. M b. Go c. G d. G e. S 33-DNA damage resulting from replication errors might halt the cell cycle in the a. M phase. b. Gi phase. c. G: phase d. S phase. e. "e" and "d

Explanation / Answer

27.d.ER membranes

IP3 diffuses to the endoplasmic reticulum, and binds to an IP3 receptor, which serves as a Ca2+ channel, and releases Ca2+ from the endoplasmic reticulum.

28.d. Membrane bound enzyme

29.a.on the extracellular side of the plasma membrane

30.c.G1 phase

G1 phase is particularly important in the cell cycle because it determines whether a cell commits to division or to leaving the cell cycle.

31.a.M

M phase involves two distinct division-related processes: mitosis and cytokinesis.

During cytokinesis, the cellular components are partitioned.

32.e.S

e S phase of a cell cycle is responsible for the synthesis or replication of DNA.

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