Insects have an excretory system consisting of Malphighian tubules

____________________ Indicate whether the statement is true or false.


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Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

Both bats and insects have wings; this is an example of 

A. convergent evolution. B. adaptive radiation. C. divergent evolution. D. polyploidy.

Biology & Microbiology