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Class 12 Exam  >  Class 12 Questions  >  Nucleoside differs from nucleotide with the a... Start Learning for Free
Nucleoside differs from nucleotide with the absence of:
  • a)
    Pentose sugar and Nitrogenous base
  • b)
    Nitrogenous base
  • c)
    Phosphoric acid
  • d)
    Pentose sugar
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Nucleoside differs from nucleotide with the absence of:a)Pentose sugar...
The structure of nucleotide and nucleoside units are distinguished primarily by the presence (or lack thereof) of this phosphate group. Deoxyribose in DNA differs from the ribose found in RNA in that it has only a hydrogen atom in the same position that ribose has a hydroxyl (-OH) group.
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Community Answer
Nucleoside differs from nucleotide with the absence of:a)Pentose sugar...
Nucleoside differ from nucleotide in absence of phosphate group .
nucleoside = nitrogenous base + sugar.
nucleotide= nucleoside+ phosphate or (sugar+ nitrogenous base + phosphate ).
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Read the passage given below and answer the following questions:EVIDENCE FOR THE FIBROUS NATURE OF DNAThe basic chemical formula of DNA is now well established. As shown in Figure 1 it consists of a very long chain, the backbone of which is made up of alternate sugar and phosphate groups, joined together in regular 3’ 5’ phosphate di-ester linkages. To each sugar is attached a nitrogenous base, only four different kinds of which are commonly found in DNA. Two of these---adenine and guanine--- are purines, and the other two thymine and cytosine-are pyrimidines. A fifth base, 5-methyl cytosine, occurs in smaller amounts in certain organisms, and a sixth, 5-hydroxy-methyl-cytosine, is found instead of cytosine in the T even phages. It should be noted that the chain is unbranched, a consequence of the regular internucleotide linkage. On the other hand the sequence of the different nucleotides is, as far as can be ascertained,completely irregular. Thus, DNA has some features which are regular, and some which are irregular. A similar conception of the DNA molecule as a long thin fiber is obtained from physicochemical analysis involving sedimentation, diffusion, light scattering, and viscosity measurements. These techniques indicate that DNA is a very asymmetrical structure approximately 20 A wide and many thousands of angstroms long. Estimates of its molecular weight currently center between 5 X106 and X107 (approximately 3 X104 nucleotides). Surprisingly each of these measurements tend to suggest that the DNA is relatively rigid, a puzzling finding in view of the large number of single bonds (5 per nucleotid e) in the phosphate-sugar back bone. Recently these indirect inferences have been confirmed by electron microscopy.Q. Out of the four different kinds of nitrogenous bases which are commonly found in DNA, ___________ has been replaced in some organisms.

Read the passage given below and answer the following questions:EVIDENCE FOR THE FIBROUS NATURE OF DNAThe basic chemical formula of DNA is now well established. As shown in Figure 1 it consists of a very long chain, the backbone of which is made up of alternate sugar and phosphate groups, joined together in regular 3’ 5’ phosphate di-ester linkages. To each sugar is attached a nitrogenous base, only four different kinds of which are commonly found in DNA. Two of these---adenine and guanine--- are purines, and the other two thymine and cytosine-are pyrimidines. A fifth base, 5-methyl cytosine, occurs in smaller amounts in certain organisms, and a sixth, 5-hydroxy-methyl-cytosine, is found instead of cytosine in the T even phages. It should be noted that the chain is unbranched, a consequence of the regular internucleotide linkage. On the other hand the sequence of the different nucleotides is, as far as can be ascertained,completely irregular. Thus, DNA has some features which are regular, and some which are irregular. A similar conception of the DNA molecule as a long thin fiber is obtained from physicochemical analysis involving sedimentation, diffusion, light scattering, and viscosity measurements. These techniques indicate that DNA is a very asymmetrical structure approximately 20 A wide and many thousands of angstroms long. Estimates of its molecular weight currently center between 5 X106and X107(approximately 3 X104nucleotides). Surprisingly each of these measurements tend to suggest that the DNA is relatively rigid, a puzzling finding in view of the large number of single bonds (5 per nucleotid e) in the phosphate-sugar back bone. Recently these indirect inferences have been confirmed by electron microscopy.Q. Purines present in DNA are

Nucleoside differs from nucleotide with the absence of:a)Pentose sugar and Nitrogenous baseb)Nitrogenous basec)Phosphoric acidd)Pentose sugarCorrect answer is option 'C'. Can you explain this answer?
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Nucleoside differs from nucleotide with the absence of:a)Pentose sugar and Nitrogenous baseb)Nitrogenous basec)Phosphoric acidd)Pentose sugarCorrect answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Nucleoside differs from nucleotide with the absence of:a)Pentose sugar and Nitrogenous baseb)Nitrogenous basec)Phosphoric acidd)Pentose sugarCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Nucleoside differs from nucleotide with the absence of:a)Pentose sugar and Nitrogenous baseb)Nitrogenous basec)Phosphoric acidd)Pentose sugarCorrect answer is option 'C'. Can you explain this answer?.
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