Barry Marshall and his collaborators showed that
A) lifestyle factors such as stress, diet, and smoking cause chronic gastritis and stomach ulcers.
B) lab animals are easily infected by Helicobacter pylori.
C) Helicobacter pylori bacteria are protective against peptic ulcers.
D) Helicobacter pylori bacteria cause chronic gastritis and stomach ulcers.
Answer: D
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What is the major lipid found in membranes?
A. steroids B. cholesterol C. triglycerides D. phospholipids E. saturated fatty acids
The occurrence of geographic isolation between two populations will ultimately lead to:
a. sexual dimorphism. b. allopatric speciation. c. morphological similarity. d. sympatric speciation. e. sexual selection.
Which substance is reabsorbed in the descending limb of the loop of Henle?
a. salts b. water c. glucose d. H+ e. urea
The nematode Caenorhabditis elegans is important to human medicine because it
A. causes elephantiasis, a disease of the lymph glands that causes the legs of humans to swell. B. is an intestinal parasite in human digestive tracts. C. has programmed cell death and therefore is useful in cancer and AIDS research. D. is transmitted by mosquitoes and causes high fevers.