Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

Name the linkage connecting monosaccharide units in polysaccharides.

Monosaccharides contain carbonyl group hence are classified, as aldose or ketose. The number of carbon atoms present in the monosaccharide molecule are also considered for classification. In which class of monosaccharide will you place fructose?

What are glycosidic linkages? In which type of biomolecules are they present?

Which monosaccharide units are present in starch, cellulose and glucose and which linkages link these units?

Assertion: Deoxyribose, \[\ce{C5H10O4}\] is not a carbohydrate.

Reason: Carbohydrates are hydrates of carbon so compounds which follow \[\ce{C_x(H2O)_y}\] formula are carbohydrates.

Assertion: Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric.

Reason: Mechanical and aesthetic properties of cellulose can be improved by acetylation.

Assertion: Most of the Synthetic polymers are not biodegradable.

Reason: Polymerisation process induces toxic character in organic molecules.

Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic polymers be made. Differentiate between biopolymers and biodegradable polymers and give examples of each type.

Which of the following statements is correct?

Which of the following is not a target molecule for drug function in body?

Which of the following statements is not true about enzyme inhibitors?

Which site of an enzyme is called allosteric site?

What type of forces are involved in binding of substrate to the active site of enzyme?

Why are certain drugs called enzyme inhibitors?

Explain the role of allosteric site in enzyme inhibition?

What happens when the bond formed between an enzyme and an inhibitor is a strong covalent bond?

Assertion: Enzymes have active sites that hold substrate molecule for a chemical reaction.

Reason: Drugs compete with natural substrate by attaching covalently to the active site of enzyme.

Assertion: Competitive inhibitors compete with natural substrate for their attachment on the active sites of enzymes.

Reason: In competitive inhibition, inhibitor binds to the allosteric site of the enzyme.

Assertion: Non-competitive inhibitor inhibits the catalyic activity of enzyme by binding with its active site.

Reason: Non-competitive inhibitor changes the shape of the active site in such a way that substrate can’t recognise it.

How do enzymes catalyse a chemical reaction in the living system? Explain drug target interaction taking the example of enzyme as target.