Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following describes the linkage in lactose, a disaccharide found in milk?
As per the NCERT text, 'Lactose... is composed of b-D-galactose and b-D-glucose. The linkage is between C1 of galactose and C4 of glucose.'
Which of the following statements is true regarding starch?
The NCERT text states, 'Starch... is a polymer of $\alpha$-glucose and consists of two components—Amylose and Amylopectin.'
Amylose, a component of starch, is characterized by:
According to the NCERT context, 'Amylose is water soluble component... Chemically amylose is a long unbranched chain with 200-1000 $\alpha$-D-(+)-glucose units held together by C1–C4 glycosidic linkage.'
Which of the following polysaccharides is structurally similar to amylopectin but is more highly branched?
The NCERT states, 'Glycogen... is also known as animal starch because its structure is similar to amylopectin and is rather more highly branched.'
Cellulose is a straight-chain polysaccharide composed exclusively of:
The context mentions, 'Cellulose is a straight chain polysaccharide composed only of $\beta$-D-glucose units which are joined by glycosidic linkage between C1 of one glucose unit and C4 of the next glucose unit.'
In a polysaccharide chain like glycogen, what is the designation for the right and left ends, respectively?
The NCERT Biology text states, 'In a polysaccharide chain (say glycogen), the right end is called the reducing end and the left end is called the non-reducing end.'
Why does cellulose not show a blue color with iodine (I2) solution, unlike starch?
The NCERT Biology text explains, 'Starch forms helical secondary structures. In fact, starch can hold I2 molecules in the helical portion. The starch-I2 is blue in colour. Cellulose does not contain complex helices and hence cannot hold I2.'
Which of the following is NOT a food storage or structural material polysaccharide?
The text states that polysaccharides 'mainly act as the food storage or structural materials.' Starch, cellulose, and glycogen are explicitly mentioned as such. While inulin is a polymer of fructose, its primary mention in the context is as a polymer, not a general storage or structural material like the others. Inulin is mainly a dietary fiber and prebiotic but not a major energy storage for plants in the same way as starch (though it stores energy in certain plants like chicory).
A carbohydrate that yields a large number of monosaccharide units on hydrolysis is termed:
From the NCERT Chemistry text, 'Carbohydrates which yield a large number of monosaccharide units on hydrolysis are called polysaccharides.'
Which of the following is true regarding amylopectin?
The NCERT text details, 'Amylopectin is insoluble in water and constitutes about 80-85% of starch. It is a branched chain polymer of $\alpha$-D-glucose units in which chain is formed by C1–C4 glycosidic linkage whereas branching occurs by C1–C6 glycosidic linkage.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.