PCAT Biological Processes – Digestive System
- Mar 20, 2018
- PCAT Question of the Day
In the digestive system, triglycerides interact with amphipathic:
B) bile salts
Click for Explanation
Triglycerides are hydrophobic dietary fats. In order to be absorbed by the digestive system, bile salts create small emulsions containing triglycerides. Bile salts themselves are created in the liver and stored in the gall bladder prior to release. Since bile salts are amphipathic, they can interact with the hydrophobic triglycerides and the aqueous environment of the digestive tract lumen.
A) pepsin, incorrect, Pepsin is the active catabolic enzyme of the zymogen pepsinogen, secreted by chief cells in the stomach.
B) bile salts, correct.
C) glycogen, incorrect, Glycogen is a branched polymer of glucose found primarily in muscle and liver cells.
D) sphingomyelin, incorrect, Sphingomyelin is a membrane sphingolipid found in animal cell membranes, especially those of myelinated nerve axons. Sphingomyelin is unlikely to be tested on the MCAT unless described in a passage.
Search the Blog
Free ConsultationSchedule Now
MCAT Blog How to Review MCAT Full-Lengths
Free MCAT Practice AccountNeed great MCAT practice?
Get the most representative MCAT practice possible when you sign up for our free MCAT Account, which includes a half-length diagnostic exam and one of our full-length MCAT practice exams.Learn More