What is the importance of the structure of the
small intestine?
a. The many folds help to mechanically break
down food.
b. The many folds help to increase the surface
area for digestion and absorption.
c. The many foods help to slow the food down
as it moves through the small intestine.
d. choices a, b, and c are all correct.
e. none of these are correct
B
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Scorpion muscle contraction is fueled directly by energy derived from
a. lactic acid. b. ADP. c. ATP. d. ethanol.
Some evidence that algae are the closest relative to plants is that they both:
a. Have chloroplasts b. Contain chlorophyll a c. Have cellulose rich cell walls d. Use starch as a nutrient reserve e. All are correct
Two diseases that represent high-priority threats as biological weapons today are
A) smallpox and typhus. B) syphilis and HIV. C) anthrax and botulinum. D) anthrax and Salmonella.
Although cells tend to be spherical, several factors influence cells to assume other shapes. Which of these does not influence cell shape?
A) cell walls B) number of mitochondria C) structural filaments within the cells D) pressure from neighboring cells E) the cytoskeleton