Which one of the following is a nucleoside? | Agrigyan

Q.16

ICAR AIEEA PG Physical Science 14 July 2023 Shift-1 Paper (Q.98)

MCQ (Single Correct) +4 −1

Which of the following can have a quaternary structure:

निम्नलिखित में से किसकी चतुर्थक संरचना हो सकती है:

Fatty acid वसा अम्ल Protein प्रोटीन Polysaccharide पॉलीसेकेराइड RNA आरएनए

Q.17

ICAR AIEEA PG Physical Science 14 July 2023 Shift-1 Paper (Q.99)

MCQ (Single Correct) +4 −1

All the following molecules contain more than one ring except:

निम्नलिखित में से किसे छोड़कर अन्य सभी अणुओं में एक से अधिक वलय होते हैं:

Cholesterol कोलेस्ट्रॉल Sucrose सुक्रोज Glucose ग्लूकोज Progesterone प्रोजेस्टेरोन

Q.18

ICAR AIEEA PG Physical Science 14 July 2023 Shift-1 Paper (Q.100)

MCQ (Single Correct) +4 −1

Which one of the following is a nucleoside?

निम्नलिखित में से कौन-सा एक न्यूक्लियोसाइड है?

Purine + Pyrimidine प्यूरीन + पिरिमिडीन Pyrimidine + Phosphate group पिरिमिडीन + फॉस्फेट समूह Purine + Phosphate group प्यूरीन + फॉस्फेट समूह Pyrimidine + Pentose sugar पिरिमिडीन + पेंटोज शर्करा

Q.19

ICAR AIEEA PG Physical Science 14 July 2023 Shift-1 Paper (Q.102)

Assertion & Reason +4 −1

Given below are two statements, one is labeled as

Assertion (A) : , and the other one is labeled as Reason (R).

Assertion (A) : Proline is an aromatic amino acid as it has a ring structure.

Reason (R) : Aromatic amino acids have a benzene ring of its derivative side chain structures.

In light of the above statements, choose the most appropriate answer from the options given below:

नीचे दो कथन दिए गए हैं, एक को अभिकथन (A) और दूसरे को कारण के रूप में चिह्नित किया गया है।

अभिकथन (A) : प्रोलीन एक एरोमैटिक अमीनो अम्ल है क्योंकि इसमें एक वलय संरचना होती है।

कारण : एरोमैटिक अमीनो अम्लों की पार्श्व श्रृंखला संरचनाओं में बेंजीन वलय या उसका व्युत्पन्न होता है।

उपर्युक्त कथनों के आलोक में, नीचे दिए गए विकल्पों में से सबसे उपयुक्त उत्तर चुनिए:

Both (A) and (R) are correct and (R) is the correct explanation of (A). Both (A) and are correct and is the correct explanation of (A). Both (A) and (R) are correct but (R) is NOT the correct explanation of (A). Both (A) and are correct but is NOT the correct explanation of (A). (A) is correct but (R) is not correct. (A) is correct but is not correct. (A) is not correct but (R) is correct. (A) is not correct but is correct.

Q.20

ICAR AIEEA PG Physical Science 14 July 2023 Shift-1 Paper (Q.106)

MCQ (Single Correct) +4 −1

Which of the following statements is correct?
(A). Allosteric enzymes don't obey Michaelis-Menten kinetics
(B). Some regulatory enzymes are modulated by reversible covalent modification
(C). Allosteric enzymes undergo reversible covalent modification
(D). Reversible covalent modification caused by phosphorylation
Choose the correct answer from the options given below:

निम्नलिखित में से कौन-से कथन सही हैं?
(A). एलोस्टेरिक एंजाइम माइकेलिस-मेन्टेन गतिकी का पालन नहीं करते हैं
(B). कुछ नियामक एंजाइम उत्क्रमणीय सहसंयोजक संशोधन द्वारा संशोधित होते हैं
(C). एलोस्टेरिक एंजाइम उत्क्रमणीय सहसंयोजक संशोधन से गुजरते हैं
(D). उत्क्रमणीय सहसंयोजक संशोधन फॉस्फोराइलेशन द्वारा होता है
नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:

(A) and (B) only. (A) and (B) only. (A), (B) and (C) only. (A), (B) and (C) only. (A), (B) and (D). (A), (B) and (D). (A), (B), (C) and (D) (A), (B), (C) and (D)

Regulation and kinetics of regulatory enzymes:

Statement (A) is correct: Allosteric enzymes exhibit sigmoidal (S-shaped) saturation curves due to cooperativity, rather than the hyperbolic kinetics of Michaelis-Menten enzymes.
Statement (B) is correct: Regulatory enzymes fall into two major classes: allosterically regulated enzymes (non-covalent effector binding) and covalently modulated enzymes.
Statement (C) is incorrect: Allosteric regulation involves reversible non-covalent binding of allosteric effectors at regulatory sites distinct from the active site.
Statement (D) is correct: The most prevalent form of reversible covalent modification is phosphorylation / dephosphorylation catalyzed by protein kinases and phosphatases.

Thus, (A), (B), and (D) are correct.

नियामक एंजाइमों के गुण:

कथन (A) सही है: एलोस्टेरिक एंजाइम सिग्मॉइडल (S-आकार) वक्र दर्शाते हैं तथा माइकेलिस-मेन्टेन गतिकी का पालन नहीं करते हैं।
कथन (B) सही है: कुछ नियामक एंजाइम उत्क्रमणीय सहसंयोजक संशोधन (Reversible covalent modification) द्वारा नियंत्रित होते हैं।
कथन (C) गलत है: एलोस्टेरिक एंजाइमों में प्रभावक अणु गैर-सहसंयोजक (Non-covalent) रूप से जुड़ते हैं।
कथन (D) सही है: प्रोटीन किनेज द्वारा फॉस्फोराइलेशन उत्क्रमणीय सहसंयोजक संशोधन का सर्वप्रमुख उदाहरण है।

अतः सही उत्तर (A), (B) और (D) है।

Explanation not matching this question? क्या व्याख्या इस प्रश्न से मेल नहीं खा रही? Report

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ICAR AIEEA PG Physical Science 14 July 2023 Shift-1 Paper

120 Questions Bilingual

ICAR AIEEA PG Physical Science 09 July 2023 (Shift 1) Paper

120 Questions Bilingual

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