The nitrogenous base that is only found in RNA and not DNA is:
A. uracil
B. guanine
C. adenine
D. thymine
E. cytosine
Answer: A
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What has led to the near elimination of kelp forests on the coasts of the United States? a. The overfishing of American lobster and cod
b. All of these choices. c. The increase of sea urchin populations. d. The decline in sea otter population.
Once glucose has entered a cell, what prevents it from diffusing back out of the cell?
a. Glucose pumps actively transported any leaked glucose back into the cell. b. One side of the cell membrane is permeable to glucose, but the other side is not. c. Glucose inhibitors attach to glucose once it’s in the cell. d. Glucose is phosphorylated, preventing it from leaving the cell. e. Glucose is hydrolyzed into two three-carbon molecules that cannot diffuse in a reverse direction.
Which of the following is a prokaryote?
A) Blechnum nudum B) Homo sapiens C) Troglodytes gorilla D) Vibrio cholerae E) Porifera
"Artery" and "vein" are defined by whether they leave or enter the heart. If they were defined by whether they carried oxygenated or deoxygenated blood, we would have to change the name(s) of
Select one: a. the hepatic portal vein to a hepatic portal artery. b. the hepatic and renal systems (they would have to be switched). c. the pulmonary artery and vein (they would have to be switched). d. the coronary artery and vein (they would have to be switched). e. the aorta and vena cava.