In the figure above, which number identifies the portion of the cell that houses the metabolic
machinery?
a. 1
b. 2
c. 5
d. 8
e. 4
E
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What is the function of white blood cell granules, which are present in eosinophils, neutrophils, basophils, and mast
cells?
a. to phagocytize pathogens and cellular debris b. to release cytokines, digestive enzymes, and toxins that kill parasites c. to activate killer T cells d. to develop into dendritic cells that phagocytize pathogens e. to act as memory cells for B lymphocytes
Cholecystokinin hormone promotes weight loss
1.True 2.False
Select the following statements that are related to mass extinctions.
A. The most severe mass extinction occurred at the end of the Cretaceous period. B. Periods of mass extinctions have occurred five times over the history of life on Earth. C. The current level of species diversity is so high it is highly unlikely that another mass extinction could occur. D. A mass extinction occurs when extinctions sharply outpace the formation of new species. E. During periods of mass extinction, dominant groups of organisms are protected and survive to repopulate.
What is the key difference between photoheterotrophs and photoautotrophs?
a. Photoautotrophs only use bacteriochlorophyll; photoheterotrophs only use chlorophyll a. b. Photoheterotrophs produce oxygen as a by-product; photoautotrophs do not. c. Photoheterotrophs use hydrogen sulfide for reducing power; photoautotrophs do not. d. Photoheterotrophs use organic compounds as their carbon source; photoautotrophs use carbon dioxide as their carbon source.