The hormone, ___, gives us that hungry feeling
when our stomachs are empty.
a. leptin
b. ghrelin
c. ADH
d. insulin
e. glucagon
B
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The membranes of winter wheat are able to remain fluid when it is extremely cold by _____
A) increasing the percentage of unsaturated phospholipids in the membrane B) increasing the percentage of cholesterol molecules in the membrane C) decreasing the number of hydrophobic proteins in the membrane D) cotransport of glucose and hydrogen E) using active transport
Ethanol, the alcohol found in wine and beer, has the molecular formula CH3CH2OH. What is the molecular weight of
ethanol if the atomic weight of C=12, H=1 and O=16?
a. 29 g/mol b. 30 g/mol c. 34 g/mol d. 45 g/mol e. 46 g/mol
Plants cannot enable and improve access to particular nutrients by
a. releasing amino acids into the soil. b. releasing carbohydrates into the soil. c. releasing enzymes into the soil. d. releasing organic substances into the soil. e. releasing carbon dioxide into the soil.
Which of the following is least likely an impact of acid rain?
a. It stops fish egg development. b. It can burn foliage. c. It releases toxins in the soil. d. It causes eutrophication. e. It can kill adult aquatic organisms.