A water molecule could move all the way through a plant from soil to root to xylem to leaf to air and pass through a living cell only once. This living cell would be a part of which structure?
A. a guard cell
B. the root epidermis
C. the endodermis
D. the root cortex
Ans: C. the endodermis
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Which of the following is an example of potential energy?
a. riding a bicycle b. swinging on a rope swing c. doing jumping jacks d. sitting on a couch
Compare the key differences between microevolution and macroevolution.
What will be an ideal response?
Which of the following thinkers argued that much of human suffering was the result of human populations increasing faster than food supply, an argument that later influenced Charles Darwin's ideas of natural selection?
A) Charles Lyell B) Thomas Malthus C) Godfrey Hardy D) Gregor Mendel
Which of the following statements regarding toxoids is FALSE?
A) They are produced against the toxin of the microorganism rather than the microorganism itself. B) They provide lifelong immunity. C) They stimulate antibody immune responses. D) They have few antigenic determinants. E) They are chemically or thermally modified.