Why Is Galactose Classified as a Simple Sugar?

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Galactose is classified as a simple sugar due to the way it is bonded together. Find out why galactose is classified as a simple sugar with help from an experienced educator in this free video clip.

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Video Transcript

Hi, I'm Robin Higgins and this is why is galactose classified as a simple sugar. Okay, so, here we have one of the cyclic forms of galactose and so remember that galactose can be acyclic as well and it can have actually a few different varieties of cyclic forms depending on if it's going to form a five or six membered ring, so here we have Alpha D Galactopyranose. Alright and so this is called a simple sugar and another word for it is a monosaccharide. Okay, so it's a monosaccharide because it's a sugar and there's only one of them. So, the most basic sugar we have is this one structure that's either a five or six membered ring usually and so we call it a saccharide and this guy gets mono. So what's an alternative to a monosaccharide? Well, it's a diasaccharide. So, this is called sucrose. This is a specific disaccharide, it is and it's general term is a disaccharide. So what this means is that you can see we have two, one, two sugars and so the difference between simple sugar and a complex sugar is just that a simple sugar cannot be broken down into more sugars. So if you start cutting galactose in half you are not going to have a sugar any more, you're going to have a couple of two or three carbon molecules, but if you cut sucrose in half right here at this linkage, you will simply have two sugars. So, simple sugar you can't dissect it to get any more sugars, more complex sugar like disaccharide or polysaccharide, you can like sucrose. I'm Robin Higgins and this is why is galactose classified as a simple sugar.


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