Signal transduction is regulated in which of the following ways The amount of si

Question

Signal transduction is regulated in which of the following ways The amount of signal present can be regulated. Enzymes in the pathway convert active forms of proteins to inactive forms. Signals are denatured. None of the above Fill in the blank in the following paragraph. "Cytosolic Ca2+ can be sensed by..., a small, conserved, dumbbell-shaped protein with four Ca2+-binding sites. Upon Ca2+ binding, it binds and activates dozens of proteins by changing its conformation in different ways." Which of the following is an inhibitory extracellular signal for cell proliferation? EGF TGF beta Erythropoietin IGF PDGF Which of the following statements about the cell cycle is false? Once a cell decides to enter the cell cycle, the time from start to finish is the same in all eukaryotic cells. An unfavorable environment can cause cells to arrest in Gl. A cell has more DNA during G2 than it did in G1. The cleavage divisions that occur in an early embryo have short G1 and G2 phases. A cell has been subjected to ultraviolet irradiation, causing a significant number of mutations in the genome. Which of the following would you NOT expect to occur as a result?

Explanation / Answer

19. B. Enzymes in the pathway convert active forms of proteins to incactive forms

During signal transduction phosphorylation and dephosphorylation cause activation or deactivation of intermediates of the pathway.

20. Calmodulin

Calmodulin is one of the calcium-binding protein that is considered a major transducer of calcium signals.

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