All of the following are arachnids EXCEPT:
a. horseshoe crabs.
b. mites.
c. scorpions.
d. ticks.
e. spiders.
Ans: a. horseshoe crabs.
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Bioluminescence is:
A. the production and emission of light by organisms B. the capture of moonlight for nocturnal photosynthesis C. the absorption of light by pigments for transfer to chlorophyll a D. the ability to detect and move away from sources of light E. the ability to detect and move toward sources of light
Components of vertebrate plasma include
_____ water. _____ red blood cells. _____ white blood cells. _____ oxygen. _____ nutrients.
Oxygen is not a greenhouse gas; therefore, gases containing oxygen—such as ozone, nitrous oxide, and carbon dioxide—are not greenhouse gases either. Which of the following is a valid response to this statement?
a. False. Oxygen is a special case because of its reactivity and electronegativity. b. True. Compounds display emergent properties that are very similar to those of the elements that form them. c. True. It is impossible for a gas containing oxygen to be a greenhouse gas. d. True. Because oxygen is not a greenhouse gas, it is unlikely to combine with anything at a higher level of organization to form a greenhouse gas. e. False. Compounds can have emergent properties that are very different from those of the elements that form them.
In a patient who is exhibiting signs of graft-versus-host disease, which cell type is most likely responsible for the reaction?
A. B cells B. T cells C. Macrophages D. Eosinophils