When rhizobia approach a plant root, the plant initially responds by
A. releasing flavonoid inducer molecules.
B. an increase in exudate.
C. an oxidative burst.
D. producing leghemoglobin.
Answer: C
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The optimum temperature for coral formation occurs where the average annual temperatures are between ____ ?C and ____ ?C
a. 18, 20 b. 20, 23 c. 23, 25 d. 25, 27 e. 30, 40
Please choose the answers that correctly describe the virulence factors of Staphylococcus aureus.
> Coagulase enzyme causes blood plasma to clot. > Staphylokinase enzyme destroys red blood cells. > Penicillinase enzyme allows S. aureus to grow in the presence of penicillin. > Hyaluronidase enzyme promotes invasion of host tissues. > Lipase enzyme causes a fever in the host.
occurs within ___ minutes to allergen. (immunological disorders)
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about bacteria is false?
a. A small percentage of bacteria are pathogenic. b. Some bacteria can photosynthesize. c. Bacteria are important decomposers. d. Bacteria are not cellular and are sometimes not classified as life forms. e. Bacteria convert atmospheric nitrogen into ammonia and then nitrates that can be used by plants.