Which of the following statements about RNAi is true?
(a) The RNAi mechanism is found only in plants and animals.
(b) RNAi is induced when double-stranded, foreign RNA is present in the cell.
(c) RISC uses the siRNA duplex to locate complementary foreign RNA molecules.
(d) siRNAs bind to miRNAs to induce RNAi.
(b)
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Antihistamines are used to treat some allergic symptoms because they neutralize the histamine mediators that cause rapid dilation of blood vessels and contraction of smooth muscles that initiate the symptoms of systemic anaphylaxis
Indicate whether the statement is true or false.
Acyclovir is the drug used to treat genital herpes; it
A. lyses the virus. B. reduces the healing time. C. cures the disease. D. All of the choices are correct.
Four of the five answers listed below are
features found in sponges. Select the EXCEPTION.
a. mesoderm b. collar cells c. larvae d. spicule e. amoeboid cells
The growth factor Superchick stimulates the proliferation of cultured chicken cells. The receptor that binds Superchick is a receptor tyrosine kinase (RTK), and many chicken tumor cell lines have mutations in the gene that encodes this receptor
Which of the following types of mutation would be expected to promote uncontrolled cell proliferation? (a) a mutation that prevents dimerization of the receptor (b) a mutation that destroys the kinase activity of the receptor (c) a mutation that inactivates the protein tyrosine phosphatase that normally removes the phosphates from tyrosines on the activated receptor (d) a mutation that prevents the binding of the normal extracellular signal to the receptor