Insects have an excretory system consisting of Malphighian tubules
____________________ Indicate whether the statement is true or false.
T
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The expression of the microRNA miR-4423 is ____ in lung tumors, and ____ its expression can decrease tumor size,
suggesting that a decrease in miR-4423 contributes to lung carcinogenesis.
a. increased; increasing b. decreased; increasing c. increased; decreasing d. decreased; decreasing e. increased; preventing
Which of the following is false concerning smooth
muscle cells? They a. do not have sarcomeres. b. contain a single nucleus. c. contain actin and myosin filaments. d. can sustain contractions longer than can striated muscle cells. e. have contractile units arranged in an orderly repeating fashion.
Both bats and insects have wings; this is an example of
A. convergent evolution. B. adaptive radiation. C. divergent evolution. D. polyploidy.
Which of the following statements if NOT true?
a. Exotoxins are more lethal than endotoxins b. Endotoxins are part of the gram-positive cell wall c. Exotoxins can be neutralized in the blood by antitoxin treatment d. Endotoxins can cause septic shock