Four of the five answers listed below are

characteristics of xylem. Select the
EXCEPTION.



a. dead at maturity
b. cell walls are impregnated with lignin
c. conducts dissolved sugars
d. includes tracheids and vessels
e. has pits in the walls of the cells


C

Biology & Microbiology

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Indicate whether the statement is true or false.

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Transformation is the process where DNA is extracted from a plasmid

A. true B. false

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In the mouse, gene A allows pigmentation to be deposited in the individual coat hairs; its allele a prevents such deposition of pigment, resulting in an albino. Gene B gives agouti (wild-type fur); its allele b gives black fur

(a) Diagram the cross between a doubly heterozygous agouti mouse mated with a doubly homozygous recessive white mouse. (b) What would be the expected phenotypic ratio in the progeny?

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Some of Darwin's most important discoveries were based on studies of birds and tortoises he observed in what location?

(A) Tahiti. (B) Jamaica. (C) Ecuador. (D) the Bahamas. (E) the Galapagos Islands.

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