Four of the five choices listed below are

characteristics of xylem. Select the exception.
a. is dead at maturity
b. cell walls are impregnated with lignin
c. conducts dissolved food
d. includes tracheids and vessels
e. has pits in the walls of the cells


Answer: c

Biology & Microbiology

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If the concept of blending inheritance were true, would variation increase or decrease over time?

A. Increase B. Decrease C. stay the same

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The subfamily of pseudoxyrhophiine snakes in Madagascar have evolved into separate species that have specially adapted to live in trees, on the ground, in water, and in burrows through the process of ________.

a. allopatric speciation b. adaptive radiation c. sympatric speciation d. allopatric radiation

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Sac of digestive enzymes= __________.

Fill in the blank(s) with the appropriate word(s).

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Halobacterium salinarum and some other haloarchaea synthesize bacteriorhodopsin proteins in response to

a. a decrease in temperature. b. a depletion of usable organic compounds. c. an increase in light. d. anoxia.

Biology & Microbiology