Flatworms have _______ nerve cords that run the length of their bodies, while nemotodes have _____.
a. one, two
b. two, three
c. two, four
d. one, four
c. two, four
Flatworms have two nerve cords that run the length of their bodies, while nematodes have four.
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All the following would be considered an aspect of microbial antagonism except:
A) competition for nutrients. B) competition for space. C) production of bacteriocins. D) production of lysozyme.
________ , also known as "jumping genes," are examples of mobile DNA elements.
Fill in the blank(s) with the appropriate word(s).
A(n) ____ includes the community and the nonliving environmental factors with which it interacts
a. community b. biosphere c. ecosystem d. multicellular organism e. earth
The signs and symptoms of infection with Helicobacter pylori are the result of
A. damage to the lining of blood vessels by H. pylori. B. invasion by H. pylori into the mucosa of the large intestine. C. invasion by H. pylori into the mucosa of the stomach. D. the production of exotoxins by H. pylori in the intestines. E. the production of toxins by H. pylori in contaminated food.