Lipid-soluble signaling molecules, such as testosterone, cross the membranes of all cells but affect only target cells because _____
A) only target cells retain the appropriate DNA segments
B) intracellular receptors are present only in target cells
C) only target cells possess the cytosolic enzymes that transduce the testosterone
D) only in target cells is testosterone able to initiate the phosphorylation cascade leading to activated transcription factor
B
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Maintenance of the uterine lining during pregnancy in mammals requires
A. estradiol. B. testosterone. C. FSH. D. LH. E. progesterone.
The cell-mediated immune response is most effective against ____
a. cancer cells only
b. viral infected cells only c. bacteria circulating in the blood d. both cancer cells and viral infected cells e. normal flora
Would plant roots exhibit gravitropism in outer space? Why or why not? What will be an ideal response?
In a cross between a true-breeding plant bearing smooth, yellow seeds and a true-breeding plant with
wrinkled, green seeds, the offspring were all smooth and yellow. What is the genotype of the F1 plants? A. SSYY B. ssyy C. SsYy D. ssYY E. SSyy