Chapter 11

Last update by mayur on 04/07/2014
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Protein phosphorylation is commonly involved with all of the following except

A) regulation of transcription by extracellular signal molecules.

B) enzyme activation.

C) activation of G protein-coupled receptors.

D) activation of receptor tyrosine kinases.

E) activation of protein kinase molecules.



Answer:

C) activation of G protein-coupled receptors.



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  • feldman2009
    Answered in Chapter 11

    Lipid-soluble signal molecules, such as testosterone, cross the membranes of all cells butaffect only target cells because

    A)only target cells retain the appropriate DNA segments.

    B) intracellular receptors are present only in target cells.

    C) most cells lack the Y chromosome required.

    D) only target cells possess the cytosolic enzymes that transduce the testosterone.

    E) only in target cells is testosterone able to initiate the phosphorylation cascade leading toactivated transcription factor.



    B) intracellular receptors are present only in target cells.