Cavitation can occur when what happens?
A. Root pressure pushes water up the xylem.
B. Stomata get stuck closed.
C. Clouds block sunlight shining on the leaves.
D. Gas bubbles expand inside a tracheid or vessel member.
E. Starch grains block the sieve tubes.
Answer: D
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What is the best test of an evolutionary classification?
Which of the following statements is NOT true of cephalopods?
A. Some are very large and can weigh as much as two tons. B. Some are very intelligent and are good learners. C. Some have shells and some do not. D. They are predatory. E. They have an open circulatory system.
Ozone consists of ________ oxygen atom(s).
A) three B) zero C) one D) two E) four
Which of the following does not pertain to endotoxins?
A. are specific bacterial cell wall lipids B. can stimulate fever in the human body C. can cause septic shock in the human body D. involved in typhoid fever and some meningitis cases E. found in acid fast bacterial cell walls