The only organisms to produce endotoxins are Gram-negative bacteria.
Answer the following statement true (T) or false (F)
True
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In a species of salamander, there are two forms, red and yellow. As the yellow form becomes less common due to predation and the red form more common, the yellow form becomes less likely to be eaten and more likely to survive and reproduce. The yellow form then becomes more common and roles of red and yellow forms reverse. This maintains both forms in the population. This would be an example of
A. negative frequency-dependent selection. B. directional selection. C. disruptive selection. D. balancing selection. E. negative frequency-dependent selection and balancing selection are correct.
The net reproduction per individual per unit time (r)
is __________ per mouse per month in a population of 1,000 mice where 500 mice are born and 400 mice die monthly. a. 0.1 b. 0.2 c. 0.3 d. 0.4 e. 0.5
"Red tides" are produced by massive blooms of
A. ciliates. B. green algae. C. dinoflagellates. D. apicomplexans. E. amoebozoans.
In a mammal, blood leaving the lungs goes to the
A) heart. B) limbs. C) liver. D) brain.