Biomolecules

Class 12th Chemistry – 14 Biomolecules MCQs

All those compounds which can be chemically correlated to (+) isomer of glyceraldehydes are said to have ____configuration.

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All those compounds which can be chemically correlated to (+) isomer of glyceraldehydes are said to have D configuration. Those compounds which can be correlated to (-) isomer of glyceraldehydes are said to have L configuration.

Maltose and lactose are ____ sugars.

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Maltose and lactose are reducing sugars. The free aldehyde group can be produced at C1 of second glucose in solution and it shows reducing properties. So, it is a reducing sugar.

____, a component of starch is insoluble in water and constitutes about ____of starch.

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Amylopectin, a component of starch is insoluble in water and constitutes about 80-85% of starch.

Vitamin B6 is also known as ____.

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Vitamin B6 is also known as pyridoxine. The right answers for the other options are: Riboflavin - vitamin B2, Thiamine - vitamin B1, Ascorbic acid - vitamin C.

Amino acids with equal number of amino and carboxyl groups are ____.

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Amino acids with equal number of amino and carboxyl groups are neutral. Amino acids with more number of amino than carboxyl groups make them basic and more carboxyl groups as compared to amino groups make them acidic.

The most common oligosaccharides are ____.

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The most common oligosaccharides are disaccharides. Trisaccharides, tetrasaccharides and pentasaccharides are the further classifications of oligosaccharides, depending upon the number of monosaccharides they provide on hydrolysis.

Sucrose is a ____sugar, since the reducing groups of glucose and fructose are involved in glycosidic bond formation.

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Sucrose is a non-reducing sugar, since the reducing groups of glucose and fructose are involved in glycosidic bond formation.

Hydrolysis of proteins gives only ____.

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Hydrolysis of proteins gives only α-amino acids. All proteins are polymers of α-amino acids.

Fructose contains a ____functional group at carbon number____.

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Fructose contains a ketonic functional group at carbon number 2.

In aqueous solution, the carboxyl group can ____ a proton and amino group can ____a proton, giving rise to a dipolar ion known as ____.

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In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as zwitter ion.

The two cyclic hemiacetal forms of glucose differ only in the configuration of the hydroxyl group at C1, called ____ carbon.

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The two cyclic hemiacetal forms of glucose differ only in the configuration of the hydroxyl group at C1, called anomeric carbon.

Vitamins ____, ____, ____ and ____ are classified as fat soluble vitamins.

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Vitamins A, D, E and K are classified as fat soluble vitamins. Vitamins B and C are classified as water soluble vitamins.

The sugar present in milk is known as ____.

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The sugar present in milk is known as lactose. The common sugar is also known as sucrose. Fruit sugar is also known as fructose. Dextrose is a form of glucose or simple sugar, present in foods.

What are the molecules that are responsible for existence of all forms of life known as?

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Biomolecules are the molecules that are responsible for existence of all forms of life.

____is the main storage polysaccharide of plants.

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Starch is the main storage polysaccharide of plants. Cellulose is the most abundant organic substance in plant kingdom. It is the structural component of the primary cell wall of green plants. Glycogen is the storage form of glucose in animals and humans, which is analogous to starch in plants. Sucrose is the organic compound commonly known as table sugar, and sometimes called saccharose.

The melting point of β-form of glucose is ____ K.

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The melting point of β-form of glucose is 423 K. The melting point of α-form of glucose is 419 K.

The two different crystalline forms of glucose are ____ and ____.

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The two different crystalline forms of glucose are α and β.

____is best known for his discovery of the structure of DNA.

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James Dewey Watson is best known for his discovery of the structure of DNA. Frederick Miescher is the man who discovered DNA in 1869.Francis Crick and Maurice Wilkins shared the 1962 Nobel Prize in Physiology and Medicine along with Watson towards their supporting evidence for the structure of DNA through X-ray diffraction patterns.

Nucleotides are joined together by phosphodiester linkage between ____ and ____ carbon atoms of the pentose sugar.

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Nucleotides are joined together by phosphodiester linkage between 5' and 3' carbon atoms of the pentose sugar.

The linkage between two monosaccharide units through oxygen atom is called ____ linkage.

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The linkage between two monosaccharide units through oxygen atom is called glycosidic linkage.

The products of the reaction involving more than ten amino acids to form a protein are called as ____.

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The products of the reaction involving more than ten amino acids to form a protein are called as polypeptides. Similarly, when two, five or six amino acids are linked, the respective products are known as dipeptides, pentapeptides and hexapeptides.

Glucose, on prolonged heating with HI, forms ____, suggesting that all the six carbon atoms are linked in a ____structure.

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Glucose, on prolonged heating with HI, forms n-hexane, suggesting that all the six carbon atoms are linked in a straight structure.

Which study deals with the study of chemical compounds and processes occurring in living organisms?

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The study of the chemical compounds and vital processes occurring in living organisms is known as biochemistry.

A native protein when subjected to a physical change, like change in ____, or a chemical change, like change in ____, the ____ bond is disturbed. It loses its biological activity called denaturation of protein.

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A native protein when subjected to physical change like change in temperature or chemical change like change in pH, the hydrogen bond is disturbed. It loses its biological activity called denaturation of protein.

_________ proteins are formed when polypeptide chains run parallel and are held together by ____and ____bonds.

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Fibrous proteins are formed when polypeptide chains run parallel and are held together by hydrogen and disulphide bonds. Example -keratin, myosin Globular proteins are formed when polypeptide chains coil around to give a spherical shape. Example - insulin, albumin.

In D(+) glucose, -OH on the lowest asymmetric carbon is on the ___side, which is comparable to (+) glyceraldehyde.

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In D(+) glucose, —OH on the lowest asymmetric carbon is on the right side, which is comparable to (+) glyceraldehyde. In L(-) glucose, —OH on the lowest asymmetric carbon is on the left side, which is comparable to (-) glyceraldehyde.

Sunflower oil is rich in vitamin ____.

Please select 2 correct answers

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Sunflower oil is rich in vitamin E. The other vitamins are rich in following sources: Option A - Vitamin K - green leafy vegetables, Option B - Vitamin D – fish, Option D - Vitamin B1- cereals.

Which are the six most abundant elements of life?

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Most biological molecules are made from covalent combinations of six important elements, whose chemical symbols are C, H, N, O, P, S.

Oxidation of glucose as well as gluconic acid with nitric acid yields ____.

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Oxidation of glucose as well as gluconic acid with nitric acid yields saccharic acid. This indicates the presence of a primary alcoholic (–OH) group in glucose. Oxalic acid, malonic acid and glutaric acid are the common nomenclatures of dicarboxylic acid.

Keratin present in hair is a ____.

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Keratin present in hair is a protein.

Class 12th Chemistry - 14 Biomolecules MCQs
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Class 12th Chemistry - 14 Biomolecules MCQs