Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
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.'
Glycogen is found in:
The NCERT says, 'Glycogen... is present in liver, muscles and brain. ...Glycogen is also found in yeast and fungi.'
Which polysaccharide is the most abundant organic substance in the plant kingdom and a predominant constituent of plant cell walls?
The NCERT states, 'Cellulose occurs exclusively in plants and it is the most abundant organic substance in plant kingdom. It is a predominant constituent of cell wall of plant cells.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.