What connects nitrogenous bases in a DNA molecule?

What connects nitrogenous bases in a DNA molecule?

• A. Covalent bonds
• B. Hydrogen bonds
• C. Ionic bonds
• D. Disulfide bridges

Answer: (B)

Nitrogenous bases in a DNA molecule are connected by hydrogen bonds. This type of bond is essential for maintaining the structure of the DNA double helix, allowing the complementary base pairs to hold together. Each nitrogenous base pairs specifically with another: adenine with thymine (A-T) and cytosine with guanine (C-G). The hydrogen bonds between these bases are relatively weak compared to covalent bonds, which is beneficial because it allows the DNA strands to separate easily during processes like replication and transcription. This property of hydrogen bonds plays a crucial role in the overall functionality of DNA within cells, ensuring that genetic information can be accurately copied and expressed.

Nitrogenous bases in a DNA molecule are connected by hydrogen bonds. This type of bond is essential for maintaining the structure of the DNA double helix, allowing the complementary base pairs to hold together. Each nitrogenous base pairs specifically with another: adenine with thymine (A-T) and cytosine with guanine (C-G). The hydrogen bonds between these bases are relatively weak compared to covalent bonds, which is beneficial because it allows the DNA strands to separate easily during processes like replication and transcription. This property of hydrogen bonds plays a crucial role in the overall functionality of DNA within cells, ensuring that genetic information can be accurately copied and expressed.