Which tissue is part of the wood of a tree, not the bark?

A) cork
B) cork cambium
C) xylem
D) phloem


C

Biology & Microbiology

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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.

Biology & Microbiology

The following bacterial species are all implicated in dental caries EXCEPT

A) Fusobacterium. B) Borrelia. C) Streptococcus. D) Lactobacillus.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology