Which tissue is part of the wood of a tree, not the bark?
A) cork
B) cork cambium
C) xylem
D) phloem
C
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The green alga Botryococcus braunii is a candidate for production of biofuel due to its ability to produce
A) and withstand large amounts of alcohols. B) hydrogen gas. C) long-chain (C30â€"C36) hydrocarbons. D) short-chain (C8â€"C14) hydrocarbons.
The following bacterial species are all implicated in dental caries EXCEPT
A) Fusobacterium. B) Borrelia. C) Streptococcus. D) Lactobacillus.
Which drug results in the development of infants
without arms or legs if taken during pregnancy? a. tetracycline b. thalidomide c. streptomycin d. salicylic acid e. codeine
Which of the following statements is true?
(a) Extracellular signal molecules that are hydrophilic must bind to a cell-surface receptor so as to signal a target cell to change its behavior. (b) To function, all extracellular signal molecules must be transported by their receptor across the plasma membrane into the cytosol. (c) A cell-surface receptor capable of binding only one type of signal molecule can mediate only one kind of cell response. (d) Any foreign substance that binds to a receptor for a normal signal molecule will always induce the same response that is produced by that signal molecule on the same cell type.