Why is carbon dioxide considered to be one of the most important of the greenhouse gases?
A. It cycles through the carbon cycle, driving all life on earth.
B. It is able to reflect infrared energy, preventing earth from heating up too much.
C. It absorbs other gases, preventing them from becoming greenhouse gases also.
D. It is able to absorb infrared energy, allowing earth to be warm enough to support life.
Answer: D
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A 36-year-old man entered the emergency department with bleeding and weight loss several weeks after returning from a trip to South America. A stool sample was taken and microscopi-cally examined. Barrel-shaped eggs with bipolar plugs were observed. The organism can be identified as:
a. T. trichiura. b. A. duodenale. c. N. americanus. d. S. stercoralis.
When fat enters the duodenum, it stimulates release of ____
a. amylase b. cholecystokinin c. gastrin d. secretin e. trypsin
Could two phenotypically normal parents have a child with cystic fibrosis?
a. Yes b. No
Lactose, the sugar in milk, is a _______, because it can be split into two monosaccharides.
Fill in the blank(s) with the appropriate word(s).