3. This enzyme is expressed on surface of intestinal brush border: therefore, de
ID: 211000 • Letter: 3
Question
3. This enzyme is expressed on surface of intestinal brush border: therefore, describe the pathway by which it is synthesized. Is it glycosylated? You do not need to go on and on - a 3 short bullets will do the job. Answer both parts. (Review cell lecture! Good review for upcoming exam) 2 pts 4. In lactose intolerant individuals, lactose cannot be broken down and thus remains in the lumen of the intestine. A) Based on what you know about osmosis, why might this lead to diarrhea? B) What can you conclude about the in kind of sugar transporter(s) present in the intestinal brush border? 3 pts A) Lactose in the milk lowers the water potential of the colon lumen so as the water potential lowers it cannot be absorbed by osmosis B)Explanation / Answer
4 (A) People with lactose intolerance do not produce enough of the lactase enzyme to break down the lactose. Instead, undigested lactose gets stuck in th guts and gets broken down by bacteria, causing gas, bloating, stomach crampsa and diarrhea
The absorption of water in the digestive track is highly dependent on the adequate absorption of solutes, the omponents of the food we eat. If our food simply remains in the gut and is not absorbed water will not be absorbed either and diarrhea will likely result.
(B) Carbohydrates are an important components of diet. The carbohydrate that we ingest range from simple monosaccharides(glucose,fructoseand galactose) to disaccharides (lactose , sucrose) to complex polysaccharides. Most carbohydrates are digested by salivary and panchreatic amylases and are further broken down into monosaccharides by enzymes in the brush border membrane (BBM) of enterocytes.
For example, lactase phloridzin hydrolaseand sucrase isomaltase are two disaccharides involved in the hydrolysis of nutritionally important disaccharides . One monosaccharides are presented to the BBM , mature enterocytes expressing nutrient transporters, transport the sugars into the enterocytes.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.