Some species of bean bug, which are common pests on soybean plants, can acquire resistance
to a common herbicide by nurturing protective bacteria in their gut. The bacteria grow well in
the gut, do not cause any harm, and receive all their nutrients from the bean bug. This is an
example of __________.
a. commensalism
b. mutualism
c. predation
d. parasitism
B
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Tumors induce blood vessel growth by secreting various ________.
a. RTKs b. substrates c. growth factors d. all of above
Which of the following is NOT true of exotoxins?
A. exotoxins are part of the bacterial cell wall B. they are usually made of protein C. Some are enterotoxins D. Some are neurotoxins E. All of the above are TRUE of exotoxins
Which of the following is a sign of disease?
A) headache B) dizziness C) fever D) nausea E) cramps
Which of the following statements is INCORRECT regarding prokaryotic cells?
A) Their DNA is not enclosed within a membrane. B) They lack membrane-enclosed organelles. C) They typically have a circular chromosome. D) They reproduce by binary fission. E) They lack a plasma membrane.