Give the name of one or more polysaccharides that matches each of the following descriptions:
c. contains only α(1→4)-glycosidic bonds

Question

Give the name of one or more polysaccharides that matches each of the following descriptions:

c. contains only α(1→4)-glycosidic bonds

Accepted Answer

Hello everybody. And welcome back. Our next question says from the following list, choose the polysaccharide or polysaccharides that contain only alpha 1 to 4 gly acidic bonds. And that is parentheses one and then a little arrow four, not one. Number 24, our answer choices are number one, Glycogen, number two, cellulose, number three, amylase or number four Amycin. So we know that some polysaccharides are a straight chain and some are branching. If our polysaccharide has only one type of gly acidic bond, that means we know it is not branching because any branch should require a different type of font. So let's look at our answer choices and see if there's any we can eliminate on that basis. And there are both Glycogen, number one and Amycin. Number four are branched polysaccharides. And in both cases, as well as the 1 to 4 Glyco bonds, they have at every branch point a 1 to 6 Glyco bond. So recall that that means that the bond goes from carbon one or the anomic carbon on one molecule of glucose to the carbon four of another glucose. But again, every time there's a branch point, you have a different kind of bond that creates that branch. So that rules out our branched polysaccharides, glycogen and Amy. So neither cellulose nor amylase have branches but cellulose. So it's a straight chain. And while cellulose does have 1 to 4 gly acidic linkages only, there's no branching. It's not alpha, 1 to 4, it has beer, 1 to 4 gly acidic bonds. And recall that alpha and beta refer to the way in which the hydroxyl group that is attached to our an American carbon, whether it's on the seam or the opposite side of the ring from carbon six, that C H2o H group. So in cellulose, those beta gly acidic bonds, they are on this, the that hydroxyl group is on the same side of the ring as the C H2O H that results in this rigid straight line structure. It has some hydrogen bonds between the different rows of these chains. And that's what gives cellulose its properties that allow it to be the structural support in plants. So that's not correct. So just by elimination, we're left with Amlo amys is indeed another straight chain um polymer of glucose, but it has only alpha 14 gly acidic bonds. And while Amy los is a straight chain, in a sense of having just a line of those glucose monomers, it has a tendency to coil, given those alpha 1 to 4 linkages, it's just the nature of those bonds. And the structure is that you end up with this coiled structure rather than the rods of the cellulose with its beta 1 to 4 like a set of bonds. So again, choice three will be our answer for the polysaccharide that contains only alpha 1 to 4 gly acidic bonds. That is number three aus. See you in the next video.

Give the name of one or more polysaccharides that matches each of the following descriptions:
c. contains only α(1→4)-glycosidic bonds

Verified video answer for a similar problem:

Key Concepts

Polysaccharides

Glycosidic Bonds

Starch

Give the name of one or more polysaccharides that matches each of the following descriptions:c. contains only α(1→4)-glycosidic bonds

Verified video answer for a similar problem:

Key Concepts

Polysaccharides

Glycosidic Bonds

Starch

Give the name of one or more polysaccharides that matches each of the following descriptions:
c. contains only α(1→4)-glycosidic bonds