Question

Starch is made up of:
A. $\alpha$-glucose pyranose
B. $\alpha$-glucose furanose
C. $\beta$-fructose pyranose
D. $\beta$-fructose furanose

Answer 1

Hint: Starch, also known as amylum, is a polymeric carbohydrate made up of several glucose units linked together by glycosidic linkages. Most green plants synthesise this polysaccharide to store energy. It is the most prevalent carbohydrate in human diets, with considerable quantities found in basic foods such as potatoes, maize (corn), rice, wheat, and cassava (manioc).

Complete answer:
Pure starch is a white powder that has no flavour or odour and is insoluble in cold water or alcohol. The linear and helical amylose, as well as the branching amylopectin, make up this molecule. Starch typically includes $25\%$ amylose and $75\%$ amylopectin by weight, depending on the plant. Glycogen, an animal's glucose reserve, is a more branched form of amylopectin. Acids, enzymes, or a mix of the two can hydrolyze starch into simpler carbohydrates. Dextrins are the fragments that arise from this process. Dextrose equivalent, which is roughly the proportion of the glycosidic bonds in starch that have been broken, is a common way to measure conversion.
Starch is a polysaccharide that is made up of a chain of glucose molecules that have been linked together to form a larger molecule. In starch, there are two kinds of polysaccharide:
Amylose is a glucose chain that runs in a straight line.
Amylopectin is a glucose chain that is extremely branched.

Pyranose is a word that refers to saccharides that contain a six-membered ring with five carbon atoms and one oxygen atom in their chemical structure. There might be more carbons outside the ring. The name comes from its resemblance to the oxygen heterocyclic pyran, except that the pyranose ring lacks double bonds. A pyranoside is a pyranose in which the anomeric OH at C(l) has been transformed to an OR group. $\alpha$-glucose pyranose is present in Starch.

A furanose is a collective name for carbohydrates with a five-membered ring system consisting of four carbon atoms and one oxygen atom in their chemical structure. The name comes from its resemblance to the oxygen heterocyclic furan, except that the furanose ring lacks double bonds.

Hence option A and D are correct.

Note:
In the production of beer, whiskey, and biofuel, starch is transformed into sugars, such as via malting, and then fermented to generate ethanol. Many of the sugars found in processed foods are made from it. Most starches, such as wheatpaste, may be made into a paste by combining them with warm water and using it as a thickening, stiffening, or glueing agent.