Which of the following layers lies next to the
lumen of the intestinal tract?
a. longitudinal muscles
b. circular muscles
c. submucosa
d. mucosa
e. serosa
D
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There is currently a drying trend due to global warming in the Southern Hemisphere
Indicate whether the statement is true or false
Hematopoietic stem cells
A) are the precursor of new blood cells. B) are maintained in the bone marrow. C) proliferate and differentiate into red blood cells, white blood cells, and platelets. D) are all of the above.
Which of these structures is analogous in function to the tracheoles of insects?
A) Skin of an earthworm B) Body surface of a flatworm C) Bronchi of a human D) Gills of a fish
When an organism such as a yeast lives by fermentation, it converts the pyruvate from glycolysis into a different compound, such as alcohol. Why doesn't it secrete the pyruvate directly?
A) The conversion yields 32 ATP per pyruvate molecule. B) The conversion yields 1 NADH per pyruvate molecule. C) The conversion is needed to regenerate the molecules needed for glycolysis. D) A buildup of pyruvate in the surrounding environment would be too toxic.