Which of the following represents the correct order of structures from outside to inside for a stem that
has a vascular cylinder?
a. stele, cortex, epidermis, pith
b. epidermis, pith, cortex, stele
c. cortex, stele, pith, epidermis
d. epidermis, cortex, stele, pith
e. stele, epidermis, pith, cortex
D
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Peristalsis is the _____
A) movement of the muscular layer surrounding the alimentary canal that is under voluntary control B) rhythmic waves of contraction of the muscular layer surrounding the alimentary canal that are responsible for moving contents of the lumen along the length of the digestive tract C) movement of nerve impulses from the central nervous system to the autorhythmic smooth muscle cells D) rhythmic lengthening and shortening of epithelial cells lining the lumen of the alimentary canal
Zebra mussels, an imported species, have disrupted the ecology of
a. Tennessee. b. the Great Lakes. c. the West Coast of the U.S. d. Yellowstone Park.
A gene accumulates one mutation every 100 years. If one species splits into two today, how many differences will
exist in that gene between the two in 500 years?
a. 2 b. 5 c. 10 d. 100 e. 500
How many different alleles for ABO blood types in the total human population exist?
a. two b. three c. four d. six e. nine