The natural antacid that protects the intestines against stomach acid is produced by the __________.
a. pancreas
b. stomach
c. liver
d. esophagus
e. small intestine
Answer: a. pancreas
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It is difficult to assign a precise phenotypic definition to alcoholism because _____
a. not enough volunteers agree to participate in genome wide association studies b. alcoholism does not have environmental components c. alcoholism is an innate behavior d. genetic testing for alcoholism is not available e. excessive consumption of alcohol is subjective
The RNA world proposal suggests that the first information molecules were
a. transfer RNA. b. ribosomes. c. messenger RNA. d. ribozymes. e. unpaired strands of DNA.
At about how many weeks of pregnancy is a chorionic villus sampling performed?
a. eight b. ten c. fourteen d. sixteen e. twenty
Cells that are alive, have thickened cell walls, and support the plant body are
A) parenchyma cells. B) tracheids. C) collenchyma cells. D) vessel elements. E) sclerenchyma cells.