Question 16 What statement best explains why glucose transported across the apical membrane in intestinal epithelial cells is classified as indirect active transport? Glucose is stored in the liver, but is initially absorbed by a different organ, the small intestine. Most sugars must be digested in the mouth to generate glucose prior to absorption in the small intestine. Glucose digestion leads to the generation of ATP and this ATP is then used to transport additional glucose. Glucose is transported both into and out of intestinal epithelial cells without consuming ATP. The formation of a glucose gradient requires a pre-existing sodium ion gradient. Question 17 Your friend works in a biotechnology company and has discovered a drug that blocks the ability of Ran to exchange GDP for GTP. What is the most likely effect of this drug on nuclear transport? Importin would be unable to bind cargo. Importin would be unable to enter the nucleus. Importin would be unable to release their cargo in the nucleus. Importin would interact irreversibly with the nuclear pore fibrils.
Added by Adriana J.
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Indirect active transport relies on the energy stored in an electrochemical gradient, usually created by the movement of ions, to transport another molecule. In the case of glucose transport, the sodium ion gradient plays a crucial role. Show more…
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Matthew S.
Glucose and sodium move from the lumen of the small intestine into the blood via transport proteins in the epithelial cells lining the small intestines (Figure 1). Based on Figure 1, describe the direct source of energy used to move glucose into the epithelial cell from the intestinal lumen. Explain how this system maximizes glucose absorption from the intestinal lumen into the epithelial cells and from the epithelial cells into the blood. Introduction to Natural Selection (notes based on video from AP Biology Youtube (March 25). Glucose and sodium move from the lumen of the small intestine into the blood via transport proteins in the epithelial cells lining the small intestines (Figure 1). Based on Figure 1, describe the direct source of energy used to move glucose into the epithelial cell from the intestinal lumen. Explain how this system maximizes glucose absorption from the intestinal lumen into the epithelial cells and from the epithelial cells into the blood.
Madhur L.
After digestion of carbohydrates, glucose must cross the intestinal brush border to get to the blood. Which one of the following statements is TRUE about glucose transport from the intestinal lumen to the blood? a. Glucose is transported from the intestinal lumen to the epithelial cell of the brush border via GLUT2. b. Glucose is transported from the epithelial cell of the brush border to the blood by Na+-glucose symporter. c. Glucose is co-transported with Na+ from the lumen to the epithelial cell of the brush border by an ion channel. d. Glucose from the epithelial cell of the brush border is transported to the blood by a uniporter. Glucose transport from the intestine to the epithelial cell of the brush border, then to the blood is an example of a primary active transport system.
Suman K.
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