Which Shows A Correctly Paired Dna Molecule

The Basics of DNA Molecule Pairing

DNA, or Deoxyribonucleic Acid, carries the genetic information of living organisms. DNA is made up of a double helix structure containing complementary base pairs. These base pairs are adenine (A) paired with thymine (T), and guanine (G) paired with cytosine (C). When DNA is replicated or transcribed, it is crucial that the base pairs are correctly matched to ensure proper functioning of the genetic code.

Characteristics of Correctly Paired DNA Molecules

In a correctly paired DNA molecule, each base on one strand of the double helix is matched with its complementary base on the other strand. This pairing follows the base pairing rules mentioned earlier: A pairs with T, and G pairs with C. The correct pairing of DNA molecules is essential for accurate replication and transcription processes.

Identifying Correctly Paired DNA Molecules

Several methods can be used to determine if a DNA molecule is correctly paired. These methods include:

  • Base Pairing Rules: The most fundamental method is to apply the base pairing rules A-T and G-C. By examining the sequence of bases in a DNA molecule, one can identify if the base pairs are correctly matched.
  • Hydrogen Bonding: Correct base pairing in DNA is facilitated by hydrogen bonding between the bases. This bonding is specific to each base pair and helps maintain the stability of the DNA molecule.
  • X-Ray Crystallography: This technique allows scientists to visualize the structure of DNA molecules at a molecular level. By studying the crystal structure, researchers can confirm if the bases are correctly paired.
  • PCR (Polymerase Chain Reaction): PCR is a technique used to amplify DNA sequences. By designing primers that bind specifically to complementary sequences, PCR can help verify the correct base pairing in DNA molecules.

Importance of Correctly Paired DNA Molecules

The correct pairing of DNA molecules is crucial for maintaining the integrity of genetic information. Here are some key reasons why correctly paired DNA molecules are important:

  • Genetic Stability: Proper base pairing ensures that genetic information is accurately passed on from one generation to the next. Errors in pairing can lead to mutations and genetic disorders.
  • Protein Synthesis: Correctly paired DNA is essential for the process of protein synthesis. The genetic code determines the sequence of amino acids in proteins, and any errors in pairing can result in faulty proteins.
  • Cell Function: DNA molecules play a central role in the functioning of cells. Proper pairing is necessary for processes like cell division, growth, and repair.

Examples of Correctly Paired DNA Molecules

There are numerous examples of correctly paired DNA molecules in nature. Some of these include:

  • Watson-Crick Model: The famous double helix structure proposed by James Watson and Francis Crick in 1953 depicts a correctly paired DNA molecule. The model shows the complementary base pairing of A-T and G-C.
  • Replicated DNA: During DNA replication, the enzyme DNA polymerase ensures that the new strands of DNA are correctly paired with the template strands. This process is essential for passing on genetic information accurately.
  • Gene Expression: In gene expression, DNA is transcribed into RNA, which then directs protein synthesis. The correct base pairing in DNA is essential for producing functional RNA molecules.


In conclusion, correctly paired DNA molecules are critical for maintaining genetic integrity and ensuring proper cellular functions. By adhering to the base pairing rules of A-T and G-C, DNA replication and transcription can proceed accurately. Identifying and understanding correctly paired DNA molecules is fundamental to the study of genetics and molecular biology.

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