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Which of the following statements is correct in relation to DNA structure?
- a)Purines and pyrimidines do not occur in equal amounts.
- b)Purine adenine is equimolar with pyrimidine cytosine.
- c)Base ratio A + T/C + G is specific for a species.
- d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements is correct in relation to DNA struc...
Explanation:
DNA structure refers to the molecular arrangement of the building blocks of DNA, which are nucleotides. Nucleotides are composed of a sugar, a phosphate group, and a nitrogenous base. There are four nitrogenous bases in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T).
The correct statement in relation to DNA structure is:
c) Base ratio A T/C G is specific for a species.
Explanation of the correct statement:
- Base ratio A T/C G: This refers to the ratio of adenine (A) to thymine (T) and cytosine (C) to guanine (G) in DNA. These base pairs always occur in a specific ratio in DNA, which is unique to each species.
- Specific for a species: The base ratio in DNA is specific to each species, which means that the ratio of base pairs in the DNA of a human is different from that of a dog or a plant. This unique base ratio is used in various applications such as DNA profiling, DNA fingerprinting, and phylogenetic analysis.
Incorrect statements:
a) Purines and pyrimidines do not occur in equal amounts: This statement is incorrect because purines (A and G) and pyrimidines (C and T) occur in equal amounts in DNA. This is because each purine is paired with a pyrimidine to form a base pair, which maintains the double-stranded nature of DNA.
b) Purine adenine is equimolar with pyrimidine cytosine: This statement is incorrect because adenine (A) is always paired with thymine (T) and cytosine (C) is always paired with guanine (G) in DNA. Therefore, the equimolar pairing is between A-T and C-G, not between A and C.
d) Pyrimidine nucleosides have 1'-9 glycosidic linkage: This statement is incorrect because pyrimidine nucleosides have a 1'-N glycosidic linkage, not a 1'-9 glycosidic linkage. The 1' carbon of the sugar in the nucleotide forms a glycosidic linkage with the nitrogenous base at the N1 position in pyrimidines and the N9 position in purines.
DNA structure refers to the molecular arrangement of the building blocks of DNA, which are nucleotides. Nucleotides are composed of a sugar, a phosphate group, and a nitrogenous base. There are four nitrogenous bases in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T).
The correct statement in relation to DNA structure is:
c) Base ratio A T/C G is specific for a species.
Explanation of the correct statement:
- Base ratio A T/C G: This refers to the ratio of adenine (A) to thymine (T) and cytosine (C) to guanine (G) in DNA. These base pairs always occur in a specific ratio in DNA, which is unique to each species.
- Specific for a species: The base ratio in DNA is specific to each species, which means that the ratio of base pairs in the DNA of a human is different from that of a dog or a plant. This unique base ratio is used in various applications such as DNA profiling, DNA fingerprinting, and phylogenetic analysis.
Incorrect statements:
a) Purines and pyrimidines do not occur in equal amounts: This statement is incorrect because purines (A and G) and pyrimidines (C and T) occur in equal amounts in DNA. This is because each purine is paired with a pyrimidine to form a base pair, which maintains the double-stranded nature of DNA.
b) Purine adenine is equimolar with pyrimidine cytosine: This statement is incorrect because adenine (A) is always paired with thymine (T) and cytosine (C) is always paired with guanine (G) in DNA. Therefore, the equimolar pairing is between A-T and C-G, not between A and C.
d) Pyrimidine nucleosides have 1'-9 glycosidic linkage: This statement is incorrect because pyrimidine nucleosides have a 1'-N glycosidic linkage, not a 1'-9 glycosidic linkage. The 1' carbon of the sugar in the nucleotide forms a glycosidic linkage with the nitrogenous base at the N1 position in pyrimidines and the N9 position in purines.
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Community Answer
Which of the following statements is correct in relation to DNA struc...
This statement is correct because base ratio A + T/C + G is always specific for a species. It is less than one in prokaryotes and more than one in eukaryotes.
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Which of the following statements is correct in relation to DNA structure?a)Purines and pyrimidines do not occur in equal amounts.b)Purine adenine is equimolar with pyrimidine cytosine.c)Base ratio A + T/C + G is specific for a species.d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements is correct in relation to DNA structure?a)Purines and pyrimidines do not occur in equal amounts.b)Purine adenine is equimolar with pyrimidine cytosine.c)Base ratio A + T/C + G is specific for a species.d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements is correct in relation to DNA structure?a)Purines and pyrimidines do not occur in equal amounts.b)Purine adenine is equimolar with pyrimidine cytosine.c)Base ratio A + T/C + G is specific for a species.d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is correct in relation to DNA structure?a)Purines and pyrimidines do not occur in equal amounts.b)Purine adenine is equimolar with pyrimidine cytosine.c)Base ratio A + T/C + G is specific for a species.d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.Correct answer is option 'C'. Can you explain this answer?.
Which of the following statements is correct in relation to DNA structure?a)Purines and pyrimidines do not occur in equal amounts.b)Purine adenine is equimolar with pyrimidine cytosine.c)Base ratio A + T/C + G is specific for a species.d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements is correct in relation to DNA structure?a)Purines and pyrimidines do not occur in equal amounts.b)Purine adenine is equimolar with pyrimidine cytosine.c)Base ratio A + T/C + G is specific for a species.d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is correct in relation to DNA structure?a)Purines and pyrimidines do not occur in equal amounts.b)Purine adenine is equimolar with pyrimidine cytosine.c)Base ratio A + T/C + G is specific for a species.d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Which of the following statements is correct in relation to DNA structure?a)Purines and pyrimidines do not occur in equal amounts.b)Purine adenine is equimolar with pyrimidine cytosine.c)Base ratio A + T/C + G is specific for a species.d)Pyrimidine nucleosides have 1'-9 glycosidic linkage.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
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