One function of HCl secreted in the stomach is to convert pepsinogen into the active enzyme pepsin. Why don't stomach cells simply secrete pepsin instead?
A. Adequate amounts of pepsin are already manufactured by the pancreas.
B. Only the pepsinogen version is able to stabilize fat-water emulsions.
C. Pepsin is denatured and rendered inactive in solutions with low pH.
D. If cells produced active pepsin, they would digest their own cellular proteins.
D. If cells produced active pepsin, they would digest their own cellular proteins.
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Nematocysts in cnidarians are:
a. reproductive cells b. excretory organs c. sets of muscle cells d. circulatory cells e. defensive cells
Leukemia is often associated with chromosomal translocations
a. True b. False
Restriction enzymes are obtained from eukaryotes.
a. true b. false
What is not true about the human large intestine?
A. It compacts and stores undigested materials until their excretion as feces. B. About 4% of fluid absorption takes place in it. C. Sodium, vitamin K, and other bacterial metabolic products are absorbed across its wall. D. It is longer than the small intestine. E. It contains three relatively straight segments with no villi.