How many amongst the following are composed of only α -D- glucose units ? i. Maltose ii. Sucrose iii. Lactose iv. Cellulose v. Amylose

Question

How many amongst the following are composed of only α -D- glucose units ? i. Maltose ii. Sucrose iii. Lactose iv. Cellulose v. Amylose (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Maltose consists of two molecules of glucose that are linked by an α -(.1,4.) glycosidic bond. Sucrose is a glycosyl glycoside formed by glucose and fructose units joined by an acetal oxygen bridge from hemiacetal of α -D- glucose to the hemiketal of the β -D- fructose. Lactose (milk sugar) is a disaccharide, obtained by the condensation of one molecule of β -D- galactopyranose and one molecule of β -D- glucopyranose. Cellulose is a polymer of glucose consists of β -(.1,4.) glycosidic linkages. Amylose is a polymer of glucose consists of α -(.1,4.) glycosidic linkages. Hence, maltose and amylose composed of only, α -D- glucose units.

$i .$	Maltose
$ii .$	Sucrose
$iii .$	Lactose
$i v .$	Cellulose
$v .$	Amylose

Q. How many amongst the following are composed of only α −D− glucose units ? i. Maltose ii. Sucrose iii. Lactose iv. Cellulose v. Amylose

Q. How many amongst the following are composed of only $α$ $- D -$ glucose units ?

$i .$ Maltose

$ii .$ Sucrose

$iii .$ Lactose

$i v .$ Cellulose

$v .$ Amylose