Which one of the following is a nucleoside? | Agrigyan

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 Correct

Nucleic acid components:

Nucleoside = Nitrogenous base (Purine or Pyrimidine) + Pentose sugar (Ribose or Deoxyribose) joined by a $\beta$-N-glycosidic bond.
Nucleotide = Nucleoside + Phosphate group (Nitrogenous base + Pentose sugar + Phosphate ester).
Thus, Pyrimidine + Pentose sugar forms a nucleoside (such as cytidine, uridine, or thymidine).

न्यूक्लिक अम्लों के घटक:

न्यूक्लियोसाइड = नाइट्रोजनी क्षार (प्यूरीन या पिरिमिडीन) + पेंटोज शर्करा (राइबोज या डिऑक्सीराइबोज)।
न्यूक्लियोटाइड = न्यूक्लियोसाइड + फॉस्फेट समूह।
अतः पिरिमिडीन + पेंटोज शर्करा एक न्यूक्लियोसाइड (जैसे साइटिडिन, यूरिडिन या थाइमिडिन) का निर्माण करता है।

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