An epidermal dendritic cell is a specialized ________.
A) squamous epithelial cell
B) phagocytic cell
C) nerve cell
D) melanocyte
B) phagocytic cell
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Chylomicrons are
a. aggregations of triglycerides formed within intestinal epithelial cells and covered with a layer of lipoprotein, which renders them water-soluble b. aggregations of bile salts, monoglycerides, and free fatty acids c. small fat globules held apart by the action of bile salts d. secreted in the succus entericus e. digested by bacteria in the colon
A common oxidizing agent used to couple chemical reactions in cells is ________.
riboflavin niacin NADH FAD
During the T wave of the electrocardiogram, the ventricles are electrically ________ and functionally ________
A) depolarizing,; relaxing B) repolarizing; contracting C) depolarizing; contracting D) repolarizing; relaxing E) neutral; at rest
Much of the digestive system relies on the activity of enzymes. The stomach secretions include an enzyme (pepsin) along with HCl to reduce the pH in the stomach to a pH of 2. When the food moves into the small intestine, there are multiple secretions to
raise the pH to 7. How would this pH change affect the activity of the stomach enzyme, pepsin? A) It would increase the activity of pepsin B) It would denature pepsin. C) There would be no change in the activity of pepsin. D) The active site would be increased.