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In DNA, the complimentary bases are:        [2008]
  • a)
    Adenine and thymine; guanine andcytosine
  • b)
    Adenine and thymine ; guanine and uracil
  • c)
    Adenine and guanine; thymine andcytosine
  • d)
    Uracil and adenine; cytosine and guanine
Correct answer is option 'A'. Can you explain this answer?
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In DNA, the complimentary bases are: [2008]a)Adenine and thymine; g...
In DNA the complimentary base are
Adenine and thymine.
Guanine and cytosine
The genetic information for cell is contained
in the sequence of bases A, T, G and C in
DNA molecule.
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Most Upvoted Answer
In DNA, the complimentary bases are: [2008]a)Adenine and thymine; g...
Nitrogen bases are of two types:1.Purines(Adenine and Guanine) 2.Pyrimidines(Cytosine and Thymine).
A purine always pairs with a pyrimidine.
Therefore,adenine pairs with thymine by double hydrogen bond and guanine with cytosine with triple hydrogen bond.
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In DNA, the complimentary bases are: [2008]a)Adenine and thymine; g...
Complimentary bases in DNA:

Introduction:
DNA (Deoxyribonucleic acid) is a double-stranded molecule that contains genetic information in living organisms. It consists of four nucleotide bases: adenine (A), thymine (T), guanine (G), and cytosine (C). The complimentary bases in DNA are pairs of nucleotides that form hydrogen bonds with each other.

Complimentary base pairing:
The complimentary bases in DNA always pair up in a specific manner. This pairing is known as base pairing, and it follows certain rules:

1. Adenine (A) pairs with Thymine (T):
- Adenine has a purine structure and can form two hydrogen bonds.
- Thymine has a pyrimidine structure and can form two hydrogen bonds.
- Adenine and Thymine are complementary to each other and always pair up.

2. Guanine (G) pairs with Cytosine (C):
- Guanine has a purine structure and can form three hydrogen bonds.
- Cytosine has a pyrimidine structure and can form three hydrogen bonds.
- Guanine and Cytosine are complementary to each other and always pair up.

Explanation of the correct answer:
The correct answer to the given question is option 'A' - Adenine and thymine; guanine and cytosine.

- Adenine (A) always pairs with Thymine (T) in DNA.
- Guanine (G) always pairs with Cytosine (C) in DNA.

This pairing is essential for the stability and replication of DNA. The complimentary base pairing allows DNA to serve as a template for the synthesis of new DNA strands during replication. Each strand of the DNA double helix acts as a template for the formation of a new strand with complementary bases.

Importance of complimentary base pairing:
- Complimentary base pairing ensures the accurate replication of DNA during cell division.
- It allows DNA to store and transmit genetic information from one generation to the next.
- The base pairing pattern helps in maintaining the structure and stability of the DNA molecule.

Conclusion:
In DNA, the complimentary bases are Adenine (A) with Thymine (T) and Guanine (G) with Cytosine (C). This specific pairing pattern is crucial for the functioning and integrity of DNA as the genetic material in living organisms.
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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.

In DNA, the complimentary bases are: [2008]a)Adenine and thymine; guanine andcytosineb)Adenine and thymine ; guanine and uracilc)Adenine and guanine; thymine andcytosined)Uracil and adenine; cytosine and guanineCorrect answer is option 'A'. Can you explain this answer?
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In DNA, the complimentary bases are: [2008]a)Adenine and thymine; guanine andcytosineb)Adenine and thymine ; guanine and uracilc)Adenine and guanine; thymine andcytosined)Uracil and adenine; cytosine and guanineCorrect answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about In DNA, the complimentary bases are: [2008]a)Adenine and thymine; guanine andcytosineb)Adenine and thymine ; guanine and uracilc)Adenine and guanine; thymine andcytosined)Uracil and adenine; cytosine and guanineCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In DNA, the complimentary bases are: [2008]a)Adenine and thymine; guanine andcytosineb)Adenine and thymine ; guanine and uracilc)Adenine and guanine; thymine andcytosined)Uracil and adenine; cytosine and guanineCorrect answer is option 'A'. Can you explain this answer?.
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