Biomolecules Chemistry Online Mock Test: NEET PYQBy admin / January 12, 2025 Uncategorized 5/5 - (1 vote)0% 1 Table of Contents ToggleReport a questionReport a questionReport a question What’s wrong with this question?You cannot submit an empty report. Please add some details. Biomolecules Chemistry NEET PYQ 2024-22NEET = National Eligibility-cum-Entrance TestNo of Questions: 15 MCQsTime: 20 MinutesPracticing questions from a variety of competitive exams is really valuable. For instance, working on these questions can still sharpen your problem-solving abilities and boost your confidence. Many topics overlap, so broader practice often leads to stronger overall performance 1 / 15The cofactor of the enzyme carboxypeptidase is: (कार्बोक्सीपेप्टिडेज़ एंजाइम का सह-कारक क्या है?) [NEET 2024] A. Zinc (जिंक) B. Niacin (नायसिन) C. Flavin (फ्लेविन) D. Haem (हीम) Solution:Carboxypeptidase (कार्बोक्सीपेप्टिडेज़) is a zinc-containing metalloenzyme (धातु-एंजाइम), so its cofactor is Zinc (जिंक). 2 / 15Ligases is a class of enzymes responsible for catalysing the linking together of two compounds. Which of the following bonds is not catalysed by it? (लाइगेज़ एंजाइमों का एक वर्ग है, जो दो यौगिकों को जोड़ने की क्रिया को उत्प्रेरित करता है। निम्नलिखित में से किस बंध के निर्माण को यह उत्प्रेरित नहीं करता?) NEET 2024 A. C – C B. P – O C. C – O D. C – N Solution:Ligases (लाइगेज़) are enzymes that catalyse the joining of two compounds by forming specific bonds such as C–O, C–S, C–N, P–O, etc.Therefore, ligases do not catalyse the formation of C–C bonds (कार्बन–कार्बन बंध), so option A is correct.Options B, C, and D are incorrect because ligases can catalyse the formation of P–O, C–O, and C–N bonds. 3 / 15Which of the following are not fatty acids? (निम्नलिखित में से कौन-से वसीय अम्ल नहीं हैं?)A. Glutamic acid (ग्लूटामिक अम्ल)B. Arachidonic acid (एराकिडोनिक अम्ल)C. Palmitic acid (पामिटिक अम्ल)D. Lecithin (लेसिथिन)E. Aspartic acid (एस्पार्टिक अम्ल)Choose the correct answer from the options given below: (नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:)[NEET 2024 Re] A. C, D and E only (केवल C, D और E) B. A and B only (केवल A और B) C. A, D and E only (केवल A, D और E) D. B and C only (केवल B और C) Solution:Glutamic acid (ग्लूटामिक अम्ल) and Aspartic acid (एस्पार्टिक अम्ल) are amino acids (अमीनो अम्ल), not fatty acids.Lecithin (लेसिथिन) is a phospholipid (फॉस्फोलिपिड), not a fatty acid.Palmitic acid (पामिटिक अम्ल) and Arachidonic acid (एराकिडोनिक अम्ल) are fatty acids (वसीय अम्ल).Therefore, A, D, and E are not fatty acids, so option C is correct. 4 / 15Inulin is a polymer of: (इन्यूलिन किसका पॉलिमर है?) [NEET 2023 mpr] A. Fructose (फ्रक्टोज) B. Galactose (गैलेक्टोज) C. Amino acids (अमीनो अम्ल) D. Glucose (ग्लूकोज) Solution:Inulin (इन्यूलिन) is a polysaccharide made up of repeating units of fructose (फ्रक्टोज), so it is a polymer of fructose 5 / 15Match List I with List II and choose the correct answer from the options given below: (सूची I का सूची II से मिलान कीजिए और नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:) [NEET 2024 Re]List I:A. Primary structure of protein (प्रोटीन की प्राथमिक संरचना)B. Secondary structure of protein (प्रोटीन की द्वितीयक संरचना)C. Tertiary structure of protein (प्रोटीन की तृतीयक संरचना)D. Quaternary structure of protein (प्रोटीन की चतुर्थक संरचना)List II:I. Human haemoglobin (मानव हीमोग्लोबिन)II. Disulphide bonds (डाइसल्फाइड बंध)III. Polypeptide chain (पॉलीपेप्टाइड श्रृंखला)IV. Alpha helix and β-sheet (अल्फा हेलिक्स और बीटा-शीट) A. A-III, B-IV, C-II, D-I B. A-III, B-II, C-I, D-IV C. A-I, B-III, C-II, D-IV D. A-IV, B-III, C-II, D-I Solution:Primary structure (प्राथमिक संरचना) refers to the linear sequence of amino acids in a polypeptide chain (पॉलीपेप्टाइड श्रृंखला), so A matches III.Secondary structure (द्वितीयक संरचना) includes alpha helix and beta-sheet (अल्फा हेलिक्स और बीटा-शीट), so B matches IV.Tertiary structure (तृतीयक संरचना) is stabilised by interactions such as disulphide bonds (डाइसल्फाइड बंध), so C matches II.Quaternary structure (चतुर्थक संरचना) is seen in proteins made of multiple polypeptide chains, such as human haemoglobin (मानव हीमोग्लोबिन), so D matches I.Therefore, the correct answer is option A. 6 / 15Choose the correct answer from the options given below [NEET 2024] A. A-IV, B-I, C-II, D-III B. A-I, B-II, C-III, D-IV C. A-II, B-III, C-IV, D-I D. A-III, B-IV, C-I, D-II 7 / 15Cellulose does not form blue colour with iodine because (सेलुलोज आयोडीन के साथ नीला रंग नहीं देता क्योंकि:) [NEET 2023] A. It is a helical molecule (यह एक हेलिकल अणु है) B. It does not contain complex helices and hence cannot hold iodine molecules (इसमें जटिल हेलिक्स संरचना नहीं होती, इसलिए यह आयोडीन अणुओं को धारण नहीं कर सकता) C. It breaks down when iodine reacts with it (यह आयोडीन के साथ प्रतिक्रिया करने पर टूट जाता है) D. It is a disaccharide (यह एक द्विशर्करा है) Solution: Cellulose (सेलुलोज) has a linear structure (रेखीय संरचना), unlike starch which forms helices (हेलिकल संरचना). Hence, iodine cannot get trapped, so no blue colour is formed. 8 / 15Choose the correct answer from the options given below: [NEET 2024] A. A-IV, B-III, C-I, D-II B. A-I, B-III, C-II, D-IV C. A-II, B-I, C-III, D-IV D. A-III, B-IV, C-I, D-II 9 / 15Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of: (मैलोनेट द्वारा सक्सिनिक डिहाइड्रोजनेज़ एंजाइम का अवरोधन किसका शास्त्रीय उदाहरण है?) [NEET 2024] A. Cofactor inhibition (सह-कारक अवरोधन) B. Feedback inhibition (प्रतिक्रिया अवरोधन) C. Competitive inhibition (प्रतिस्पर्धी अवरोधन) D. Enzyme activation (एंजाइम सक्रियण) Solution:Malonate (मैलोनेट) resembles succinate (सक्सिनेट) and competes for the enzyme’s active site, so it shows competitive inhibition (प्रतिस्पर्धी अवरोधन). 10 / 15Which of the following graphs depicts the effect of substrate concentration on velocity of enzyme catalysed reaction? (निम्नलिखित में से कौन-सा ग्राफ एंजाइम-उत्प्रेरित अभिक्रिया में सब्सट्रेट सांद्रता का अभिक्रिया वेग पर प्रभाव दर्शाता है?)[NEET 2024 Re] A B C D Solution:In an enzyme-catalysed reaction (एंजाइम-उत्प्रेरित अभिक्रिया), as substrate concentration (सब्सट्रेट सांद्रता) increases, the reaction velocity (अभिक्रिया वेग) also increases initially because more enzyme active sites are available.After a certain point, all active sites become saturated (संतृप्त), so the reaction reaches a maximum velocity called Vmax (अधिकतम वेग).Therefore, the correct graph is the hyperbolic curve shown in option A. 11 / 15Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of (मैलोनेट रोगजनक बैक्टीरिया की वृद्धि को किस एंजाइम की क्रिया को अवरुद्ध करके रोकता है?) [NEET 2023] A. Amylase (एमाइलेज) B. Lipase (लिपेज़) C. Dinitrogenase (डाइनाइट्रोजनेज़) D. Succinic dehydrogenase (सक्सिनिक डिहाइड्रोजनेज़) Solution: Malonate (मैलोनेट) is a competitive inhibitor (प्रतिस्पर्धी अवरोधक) of succinic dehydrogenase (सक्सिनिक डिहाइड्रोजनेज़), thus inhibiting bacterial growth. 12 / 15Which of the following is not a secondary metabolite? (निम्नलिखित में से कौन-सा द्वितीयक उपापचय उत्पाद नहीं है?) [NEET 2023 mpr] A. Curcumin (कर्क्यूमिन) B. Morphine (मॉर्फीन) C. Anthocyanin (एंथोसायनिन) D. Lecithin (लेसिथिन) Solution:Curcumin, morphine, and anthocyanin are secondary metabolites (द्वितीयक उपापचय उत्पाद). Lecithin (लेसिथिन) is a primary metabolite (प्राथमिक उपापचय उत्पाद), so it is not a secondary metabolite. 13 / 15Which of the following is a nucleotide? (निम्नलिखित में से कौन-सा न्यूक्लियोटाइड है?) [NEET 2024] A. Uridine (यूरिडीन) B. Adenylic acid (एडेनिलिक अम्ल) C. Guanine (ग्वानिन) D. Guanosine (ग्वानोसिन) Solution:Uridine (यूरिडीन) is a nucleoside (न्यूक्लियोसाइड), so option A is incorrect.Adenylic acid (एडेनिलिक अम्ल) is a nucleotide (न्यूक्लियोटाइड), so option B is correct.Guanine (ग्वानिन) is a nitrogenous base (नाइट्रोजनयुक्त क्षार), so option C is incorrect.Guanosine (ग्वानोसिन) is a nucleoside (न्यूक्लियोसाइड), so option D is incorrect. 14 / 15Enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds, are known as: (वे एंजाइम जो हाइड्रोलाइसिस के अलावा अन्य प्रक्रियाओं द्वारा सब्सट्रेट से समूह हटाकर द्विबंध छोड़ते हैं, कहलाते हैं:) [NEET 2024 Re] A. Transferases (ट्रांसफरेज़) B. Oxidoreductases (ऑक्सीडोरिडक्टेज़) C. Dehydrogenases (डीहाइड्रोजनेज़) D. Lyases (लाइएज़) Solution:Lyases (लाइएज़) are enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis (हाइड्रोलाइसिस) or oxidation, often resulting in the formation of double bonds (द्विबंध).Transferases (ट्रांसफरेज़) transfer functional groups from one molecule to another, so option A is incorrect.Oxidoreductases (ऑक्सीडोरिडक्टेज़) are involved in oxidation-reduction reactions, so option B is incorrect.Dehydrogenases (डीहाइड्रोजनेज़) are a type of oxidoreductase, so option C is also incorrect.Therefore, the correct answer is option D: Lyases (लाइएज़). 15 / 15Question: Regarding catalytic cycle of an enzyme action, select the correct sequential steps: (एंजाइम क्रिया के उत्प्रेरक चक्र के सही क्रमिक चरणों का चयन कीजिए:) [NEET 2024]Statements:A. Substrate enzyme complex formation (सब्सट्रेट-एंजाइम कॉम्प्लेक्स का निर्माण)B. Free enzyme ready to bind with another substrate (मुक्त एंजाइम अगले सब्सट्रेट से जुड़ने के लिए तैयार)C. Release of products (उत्पादों का मुक्त होना)D. Chemical bonds of the substrate broken (सब्सट्रेट के रासायनिक बंधों का टूटना)E. Substrate binding to active site (सब्सट्रेट का सक्रिय स्थल से जुड़ना) A. E, A, D, C, B B. A, E, B, D, C C. B, A, C, D, E D. E, D, C, B, A Solution:First substrate binds to active site (E), then enzyme-substrate complex forms (A).Next bonds break (D), products are released (C), and enzyme becomes free again (B) Your score isThe average score is 52% 0% Restart quiz 0% 0 Report a question What’s wrong with this question?You cannot submit an empty report. Please add some details. Biomolecules Chemistry NEET PYQ 2022-19NEET = National Eligibility-cum-Entrance TestNo of Questions: 15 MCQsTime: 20 MinutesPracticing questions from a variety of competitive exams is really valuable. For instance, working on these questions can still sharpen your problem-solving abilities and boost your confidence. Many topics overlap, so broader practice often leads to stronger overall performance 1 / 15Match List-I with List-II and choose the correct answer: [PYQ 2021]List I:(a) Protein(b) Unsaturated fatty acid(c) Nucleic acid(d) PolysaccharideList II:(i) C = C double bonds(ii) Phosphodiester bonds(iii) Glycosidic bonds(iv) Peptide bonds A. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) B. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii) C. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii) D. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii) Solution: Proteins have peptide bonds, unsaturated fatty acids have C=C bonds, nucleic acids have phosphodiester bonds, and polysaccharides have glycosidic bonds. 2 / 15Purines found both in DNA and RNA are [PYQ 2019] A. Adenine and guanine B. Guanine and cytosine C. Cytosine and thymine D. Adenine and thymine Solution:Purines are nitrogenous bases with a double-ring structure. Adenine and guanine are purines present in both DNA and RNA. 3 / 15"Ramachandran plot" is used to confirm the structure of: [PYQ 2019] A. RNA B. Proteins C. Triacylglycerides D. DNA Solution: Ramachandran plot shows allowed phi (φ) and psi (ψ) angles of amino acids, helping to confirm protein structure 4 / 15A dehydration reaction links two glucose molecules to produce maltose. If the formula for glucose is C₆H₁₂O₆, then what is the formula for maltose? [PYQ 2022] A. C₁₂H₂₀O₁₀ B. C₁₂H₂₄O₁₂ C. C₁₂H₂₂O₁₁ D. C₁₂H₂₄O₁₁ Solution: Two glucose molecules combine and one molecule of water (H₂O) is removed:C₆H₁₂O₆ + C₆H₁₂O₆ − H₂O = C₁₂H₂₂O₁₁. 5 / 15Read the following statements on lipids and find out the correct set of statements: [PYQ 2022](a) Lecithin found in the plasma membrane is a glycolipid(b) Saturated fatty acids possess one or more C=C bonds(c) Gingely oil has lower melting point, hence remains as oil in winter(d) Lipids are generally insoluble in water but soluble in some organic solvents(e) When fatty acid is esterified with glycerol, monoglycerides are formed A. (a), (b) and (c) only B. (a), (d) and (e) only C. (c), (d) and (e) only D. (a), (b) and (d) only Solution:(a) Incorrect → Lecithin is a phospholipid, not a glycolipid.(b) Incorrect → Saturated fatty acids do not have C=C bonds.(c) Correct → Unsaturated oils have low melting points.(d) Correct → Lipids are insoluble in water but soluble in organic solvents.(e) Correct → Esterification of fatty acid with glycerol can form monoglycerides. 6 / 15Following are the statements with reference to lipids. Choose the correct answer: [PYQ 2021](a) Lipids having only single bonds are called unsaturated fatty acids(b) Lecithin is a phospholipid(c) Trihydroxy propane is glycerol(d) Palmitic acid has 20 carbon atoms including carboxyl carbon(e) Arachidonic acid has 16 carbon atoms A. (a) and (b) only B. (c) and (d) only C. (b) and (c) only D. (b) and (e) only Solution:(a) Incorrect → Single bonds indicate saturated fatty acids.(b) Correct → Lecithin is a phospholipid.(c) Correct → Glycerol is trihydroxy propane.(d) Incorrect → Palmitic acid has 16 carbons.(e) Incorrect → Arachidonic acid has 20 carbons. 7 / 15 A B C D Solution:Option (4) is the correct answer because Malonate is the competitive inhibitor of catalytic activity of succinic dehydrogenase, so (a) matches with (ii) in column II.Collagen is proteinaceous in nature and possesses peptide bonds, so (b) matches with (iv) in column II.Chitin is a homopolymer present in the cell wall of fungi and exoskeleton of arthropods,so, (c) matches with (iii) in column II.Abrin and Ricin are toxins, secondary metabolites, so (d) in column I matches with (i) in column II. 8 / 15Prosthetic groups differ from co-enzymes in that A. they require metal ions for their activity. B. they (prosthetic groups) are tightly bound to apoenzymes. C. their association with apoenzymes is transient. D. they can serve as co-factors in a number of enzyme-catalyzed reactions. 9 / 15Identify the substances having glycosidic bond and peptide bond, respectively in their structure [PYQ-2020] Options: A. Glycerol, trypsin B. Cellulose, lecithin C. Inulin, insulin D. Chitin, cholesterol Solution: Inulin is a fructan (polysaccharide of fructose). Adjacent fructose units are linked through glycosidic bond. Insulin is a protein composed of 51 amino acids. Adjacent amino acids are attached through peptide bond. 10 / 15Primary proteins are also called as polypeptides because: [PYQ-2022] A. They can assume many conformations B. They are linear chains C. They are polymers of peptide monomers D. Successive amino acids are joined by peptide bonds 11 / 15Which of the following are not secondary metabolites in plants? [PYQ 2021] A. Morphine, codeine B. Amino acids, glucose C. Vinblastin, curcumin D. Rubber, gums Solution: Amino acids and glucose are primary metabolites involved in normal metabolic processes. Morphine, codeine, vinblastin, curcumin, rubber, and gums are secondary metabolites. 12 / 15Given below are two statements:Statement I: Amino acids have a property of ionizable nature of —NH₂ and —COOH groups, hence have different structures at different pH.Statement II: Amino acids can exist as zwitterionic form at acidic and basic pH.In the light of the above statements, choose the most appropriate answer:[PYQ -2022] A. Statement I is incorrect but Statement II is correct B. Both Statement I and Statement II are correct C. Both Statement I and Statement II are incorrect D. Statement I is correct but Statement II is incorrect Statement I :Correct Statement ll: Correct, Zwitterion formation takes place at isoelectric point that can be at acidic or basic pH. 13 / 15Primary proteins are also called as polypeptides because: (प्राथमिक प्रोटीन को पॉलीपेप्टाइड क्यों कहा जाता है?) [NEET Re-2022] A. They can assume many conformations (ये कई प्रकार की संरचनाएँ ग्रहण कर सकते हैं) B. They are linear chains (ये रैखिक श्रृंखलाएँ हैं) C. They are polymers of peptide monomers (ये पेप्टाइड मोनोमर के पॉलिमर हैं) D. Successive amino acids are joined by peptide bonds (क्रमागत अमीनो अम्ल पेप्टाइड बंधों द्वारा जुड़े होते हैं) Solution: Primary proteins (प्राथमिक प्रोटीन) are called polypeptides because amino acids (अमीनो अम्ल) are linked together by peptide bonds (पेप्टाइड बंध), forming a chain. 14 / 15In the enzyme which catalyses the breakdown of:H₂O₂ → H₂O + O₂the prosthetic group is:[PYQ-2022] A. Niacin B. Nicotinamide adenine dinucleotide C. Haem D. Zinc Solution: Catalase and peroxidase enzymes break down hydrogen peroxide, and they contain haem as the prosthetic group. 15 / 15Match List I with List II and choose the correct answer from the options given below: (सूची I का सूची II से मिलान कीजिए और सही उत्तर चुनिए:) [NEET Re-2022]List I:(a) Adenine (एडेनिन)(b) Anthocyanin (एंथोसायनिन)(c) Chitin (काइटिन)(d) Codeine (कोडीन)List II:(i) Pigment (रंजक)(ii) Polysaccharide (पॉलीसैकराइड)(iii) Alkaloid (एल्कलॉइड)(iv) Purine (प्यूरिन) A. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii) B. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) C. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) D. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii) Solution: Adenine is a purine (प्यूरिन), Anthocyanin is a pigment (रंजक), Chitin is a polysaccharide (पॉलीसैकराइड), and Codeine is an alkaloid (एल्कलॉइड). Your score isThe average score is 0% 0% Restart quiz Post Views: 121
