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Solution for Class 12, Biology, Biological Molecules

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_______ is a 16C saturated fatty acid.

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Biological Molecules

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_____ is composed of two molecules of glucose.

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Biological Molecules

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A : Allosteric enzymes do not show a typical Michaelis Menten constant or behaviour.
R : All enzymes work at same pH. a. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1). b. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2). c. If Assertion is true statements but Reason is false, then mark (3). d. If both Assertion and Reason are false statements, then mark (4)

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Biological Molecules

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α

amylase of wheat endosperm has 16 isoenzymes.
R : In competitive inhibition

V_{m a x}

decreases.a. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1). b. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2). c. If Assertion is true statements but Reason is false, then mark (3). d. If both Assertion and Reason are false statements, then mark (4)

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Biological Molecules

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β

-pleated sheet organisation in a polypeptide chain is an example of a. a)

1^{\circ}

structure b. b)

2^{\circ}

structure c. c)

3^{\circ}

structure d. d)

4^{\circ}

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Biological Molecules

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A coenzyme is a. Organic non-proteinaceous group that is essential for enzyme activity b. Organic or inorganic group that is essential for enzyme activity c. Same enzyme found in different organs or tissues d. One that shares function o another enzyme

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Biological Molecules

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A competitive inhibitor binds to the enzyme at the a. Active site b. Allosteric site c. To enzyme substrate complex d. None of the above

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Biological Molecules

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A compound formed by one molecule each of pentose sugar,phosphate and nitrogenous base.

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Biological Molecules

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A monosaccharide is a. Lactose b. Sucrose c. Ribose d. Maltose

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Biological Molecules

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Question 10

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A non-essential amino acid : a. is synthesized in the body b. is not synthesized in the body c. must be supplied by the diet d. is not a nutrient

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Question 11

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A non-protein organic part attached firmly by covalent linkage to apoenzyme is a. Cofactor b. Coenzyme c. Prosthetic group d. Activator

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Biological Molecules

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Question 12

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A polymer of identical mono-saccharides.

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Biological Molecules

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Question 13

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A protein is made up of : a. modified glucose molecules b. amino acids c. nucleotides d. nucleosides

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Biological Molecules

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Question 14

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A protein that has three helical polypeptides supercoiled to form a rope like structure is a. Insulin b. Collagen c. Haemoglobin d. Both (1) & (3)

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Biological Molecules

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Question 15

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A secondary metabolite that acts as a toxin is a. Carotenoids b. Curcumin c. Abrin d. Monoterpenes

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Biological Molecules

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Question 16

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A substance that accelerates a chemical reaction, but itself is unchanged when the reaction is over, is a ................ In living systems, most of these substances are proteins known as ................... .

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Biological Molecules

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Question 17

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A typical homopolysaccharide is a. Starch b. Lignin c. Insulin d. Suberin

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Biological Molecules

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Question 18

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About 98 percent of the mass of every living organism is composed fo just six elements including carbon, hydrogen , nitroge , oxygen and a. Calcium and phosphorus b. Phosphours and sulphur c. Sulphur and magnesium d. Magnesium and sodium

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Biological Molecules

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Question 19

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About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen anda. sulphur and magnesium b. magnesium and sodium c. calcium and phosphorus d. phosphorus and sulphur

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Biological Molecules

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Question 20

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_____acts as second messenger in the cell.

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Biological Molecules

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