151.

Which one of the following combination of all three fatty acids are essential for human beings?

• Oleic acid, linoleic acid and linolenic acid

• Palmitic acid, linoleic acid and arachidonic acid

• Oleic acid, linoleic acid and arachidonic acid

• Linoleic acid, linolenic acid and arachidonic acid

An allosteric inhibitor of the enzyme acts by binding to the

• substrate

• product

• catalytic site of the enzyme

• non-catalytic site of the enzyme

Which one of the followings is correct for the trans membrane proteins in lipid bilayer?

• They are absent in animal cells

• They act as channel proteins

• They are absent in plant cells

• They are only externally located

Which of the following statements is/are correct regarding the effects of pH on enzyme catalysed reactions?

• Direction of the reaction is influenced by [H⁺]

• Ionisation state of dissociating groups on the enzyme is modified

• Ionisation state of the substrate is modified.

• Protein is not denatured with the change in pH

Which one from those given below represents the position of nitrogen in the 9-membered double rings of purines?

• 2, 4, 6 and 8

• 1, 3, 7 and 9

• 1, 4, 8 and 9

• 3, 5, 7 and 8

Out of the given below statements describing the characteristics of various biomolecules, option for the incorrect one

• Fatty acids have hydrocarbon chains that end in a carboxylic group

• Starch consist of amylose and glycogen, which are formed by the condensation of $\mathrm{\alpha }$-D-glucose.

• Cellulose is fibrous polysaccharide of high tensile strength.

• Cutin is a complex lipid produced by cross-esterification and polymerisation of hydroxy fatty acids.

Identify the correct match from the type of amino acids and their respective example.

• Neutral - Proline (Pro)

• Acidic - Asparagine (Asn)

• Aromatic - Tryptophan (Try)

• S-containing - Methionine (met)

When all the active sites of the enzyme are occupied, how does increasing the substrate concentration affect the rate ofreaction?

• The rate of reaction will slow down

• The rate of reaction will become constant, and shows no increase

• The rate of reaction will increase with increasing substrate concentration

• The rate of reaction will become reactive in such condition

Which ofthe following unsaturated fatty acid possess four double bond?

• Arachidonic acid

• Linolenic acid

• Oleic acid

• Linoleic acid

Polysaccharides, polypeptides and polynucleotides have in common that they all

• contain amino acid

• are formed in condensation reactions

• contain nitrogen

• come out in acid soluble pool