Apoptosis involves the activation of enzymes called ________, which are the cell "executioners" that activate other enzymes in the nucleus that fragment the DNA.
A. neutrophils
B. peroxisomes
C. lysosomes
D. caspases
Answer: D
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This molecule is found in RNA but not DNA:
a. ribose sugar b. deoxyribose sugar c. adenine d. cytosine
The enzyme catalase acts on the substrate
A) hydrogen. B) oxygen. C) peroxidase. D) hydrogen peroxide.
Which is TRUE about fat-soluble vitamins?
A. They must be digested to fatty acids and monoglyceride before being absorbed. B. Examples include vitamins A, B12, and D. C. Their normal absorption depends on normal secretion of bile salts. D. They are absorbed into GI capillaries and travel immediately to the liver in the hepatic portal vein, for storage. E. They don't need to be ingested because the body can manufacture all of them in sufficient quantities.
Hormones with short half-lives
A. have concentrations that increase slowly. B. regulate activities of delayed onset and long duration. C. are maintained at relatively constant levels. D. regulate activities of rapid onset and short duration. E. are usually lipid-soluble.