In fetal circulation, most blood is shunted away from the lungs. Why is this the case?
A) The lungs don't need any blood.
B) The fetus receives oxygen at the placenta, and the lungs are not yet fully functional.
C) The lungs do not form until right before birth.
D) The lungs have their own circulation.
Answer: B
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Which one of the following entities does not possess the ability to synthesize its own proteins?
?A. a B. a C. a D. a E. a bacterial cell
Cavitation can occur when what happens?
A. Root pressure pushes water up the xylem. B. Starch grains block the sieve tubes. C. Gas bubbles expand inside a tracheid or vessel member. D. Stomata get stuck closed. E. Clouds block sunlight shining on the leaves.
Which of the following combinations of organisms could be expected to survive in isolation from
other forms of life available? a. producers and decomposers b. producers and carnivores c. carnivores and decomposers d. herbivores, carnivores, and decomposers e. producers, herbivores, carnivores, and decomposers.
All of the following bases are found in RNA molecules EXCEPT
A) adenine. B) thymine. C) uracil. D) cytosine. E) guanine.