Which of the following are examples of exotoxins?

a. streptolysin
b. coagulase
c. collagenase
d. keratinase
e. kinase
f. LPS
g. hemolysis


a. streptolysin
g. hemolysis

Biology & Microbiology

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On the pH scale, numbers below 7 indicate acidic solutions

Indicate whether the statement is true or false

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If ozone layers in the atmosphere are depleted

A. more infrared wavelength radiation will reach Earth's surface, causing more cases of skin cancer. B. more ultraviolet wavelength radiation will reach Earth's surface, causing more genetic damage in organisms. C. less visible wavelength radiation will reach Earth's surface, causing an increase in photosynthesis. D. less ultraviolet wavelength radiation will reach Earth's surface, causing global cooling. E. less infrared wavelength radiation will reach Earth's surface, causing global warming.

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What do the Plains toadfoot toads require in order to choose New Mexico spadefoot toads as their mate?

A. sand B. snow C. rain D. dry weather

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The evolutionary innovation that first appeared in arthropods and is characteristic of the most successful of all animal groups is that of

A. bilateral symmetry. B. three primary types of tissues. C. coelomic body architecture. D. segmentation. E. jointed appendages.

Biology & Microbiology