Which shape characterizes the structure of DNA?

Which shape characterizes the structure of DNA?

• A. Single strand
• B. Double helix
• C. Triple helix
• D. Square

Answer: (B)

The structure of DNA is characterized by a double helix shape. This configuration consists of two long strands of nucleotides that wind around each other, resembling a twisted ladder. The sides of the ladder are formed by alternating sugar and phosphate groups, while the rungs consist of paired nitrogenous bases held together by hydrogen bonds. The double helix structure is crucial for the stability of DNA and allows it to store and transmit genetic information effectively. The double helical structure is not only aesthetically unique but also functionally significant. It enables the precise replication of DNA during cell division, as each strand can serve as a template for synthesizing a new strand. Errors during replication can be minimized due to the complementary base pairing that occurs in the double helix, which ensures that the genetic code is accurately transmitted to daughter cells. In contrast, single-stranded DNA lacks this structural stability, and structures like triple helix or square shapes do not naturally occur in biological DNA. The double helix provides essential mechanical and chemical properties that are fundamental to its ability to function as the molecule of heredity in all known life forms.

The structure of DNA is characterized by a double helix shape. This configuration consists of two long strands of nucleotides that wind around each other, resembling a twisted ladder. The sides of the ladder are formed by alternating sugar and phosphate groups, while the rungs consist of paired nitrogenous bases held together by hydrogen bonds. The double helix structure is crucial for the stability of DNA and allows it to store and transmit genetic information effectively.

The double helical structure is not only aesthetically unique but also functionally significant. It enables the precise replication of DNA during cell division, as each strand can serve as a template for synthesizing a new strand. Errors during replication can be minimized due to the complementary base pairing that occurs in the double helix, which ensures that the genetic code is accurately transmitted to daughter cells.

In contrast, single-stranded DNA lacks this structural stability, and structures like triple helix or square shapes do not naturally occur in biological DNA. The double helix provides essential mechanical and chemical properties that are fundamental to its ability to function as the molecule of heredity in all known life forms.