Moof's Medical Biochemistry Video Course: http://moof-university.thinkific.com/courses/medical-biochemistry-for-usmle-step-1-exam Questions Answered in This Video: - What is a membrane lipids / What are membrane lipids? - What do membrane lipids contain? How are they structured? - What are the different types of membrane lipids, and how can they be classified? Don't forget to LIKE, COMMENT, and SUBSCRIBE: http://www.youtube.com/subscription_center?add_user=MoofUniversity INFORMATION ABOUT TUTORING: http://www.moofuniversity.com/tutoring/ TO SUPPORT MOOF UNIVERSITY WITH A FINANCIAL CONTRIBUTION: http://www.moofuniversity.com/support-moof/ INSTAGRAM: https://instagram.com/moofuniversity/ FACEBOOK: https://www.facebook.com/pages/Moof-University/1554858934727545 TWITTER: https://twitter.com/moofuniversity Video Content Summary: Membrane lipids, simply, are lipids that make up membranes. Because of this, they must be amphipathic / amphiphilic molecules with a polar head group and a nonpolar tail. There are different classes of membrane lipids. In fact, there's more than one way to classify them. One way (shown in this video) is to separate them based on the polar head group they contain. The other way would be to separate them based on the backbone they have. If you divide them up based on the polar head group they contain, you will have 1) phospholipids, with phosphate alcohol groups as the polar head group and 2) glycolipids, with a carbohydrate portion as the polar head group. From there, you can have a phospholipid with a glycerol backbone (a glycerophospholipid) or a phospholipid with a sphingosine backbone (a sphingophospholipid). Or, if you have a glycolipid, that can have a glycerol backbone (a galactolipid) or a sphingosine backbone (a glycosphingolipid). Further, if a galactolipid has a sulfate group attached to the carbohydrate portion, that is called a sulfolipid. If you divide them based on their backbones, you'll have glycerolipids with glycerol backbones and sphingolipids with sphingosine backbones. That, however, is not shown in the video. Glycerolipids will have two fatty acid tails attached, while sphingolipids will only have one fatty acid tail attached, as its backbone extends around as a hydrocarbon tail.