Which of the following is true of phloem?

a. conducts water up the plant
b. conducts mineral ions up the plant
c. connects with roots
d. connects with leaves
e. transports plant-manufactured organic products


Answer: e

Biology & Microbiology

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Bryophytes differ from all other land plants in

that they

a. possess swimming sperm. b. have stomata. c. have dependent sporophytes. d. exhibit alternation of generations. e. protect the embryo inside parental tissue

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The presence of the disease sickle cell anemia illustrates that natural selection does not always eliminate ________ alleles.

A. neutral B. recessive C. polymorphic D. dominant

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Which of the following are the most commonly used mammals for genetic studies?

a. Humans b. Xenopus laevis c. Mice d. Cats

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The matching nucleotide base pairs in DNA are bound to one another by__________ bonds.

A) covalent B) ionic C) peptide D) hydrogen

Biology & Microbiology