Which of these plant tissue types is composed of sieve-tube members and companion cells, and transports organic nutrients made in the leaves?

A. collenchyma
B. sclerenchyma
C. xylem
D. phloem
E. parenchyma


Answer: D

Biology & Microbiology

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Which diseases are associated with imprinting?

A. Angelman Syndrome B. LHON C. Alzheimer's Disease D. All of the answers are correct

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Teleost fishes deal with the osmotic stress of living in seawater in part by

a. active transport of ions into the body through the gills. b. excreting nitrogenous wastes through their kidneys as urea. c. active transport of ions out of the body by chloride cells. d. excreting excess salt through the actions of specialized salt glands in their heads. e. maintaining high levels of urea and trimethylamine oxide in body fluids.

Biology & Microbiology

Koopmans (1981) transplanted an extra stomach and length of intestine into rats and then joined the major arteries and veins of the implants to the recipients' circulatory systems. He found that food injected into the transplanted stomach and kept there by a noose around the pyloric sphincter:

(a) decreased eating in proportion to both its caloric content and volume (b) increased eating in proportion to both its caloric content and volume (c) did not affect eating (d) produced a conditioned taste aversion for the injected food

Biology & Microbiology

Identify the animal that lacks a specialized respiratory organ

A) Bird B) Grasshopper C) Bat D) Trout E) Sponge

Biology & Microbiology