Question detail
What is the significance of the sugar-phosphate backbone in the structure of DNA?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Amino acids, proteins and DNA (A-level only)
Question
What is the significance of the sugar-phosphate backbone in the structure of DNA?
Answer
The sugar-phosphate backbone provides structural stability to the DNA molecule and protects the genetic information encoded in the nitrogenous bases. It also allows for the formation of the double helix structure, which is essential for DNA replication and function.
Explanation
This answer is strong as it addresses the importance of the sugar-phosphate backbone in maintaining DNA integrity and its role in biological processes. The question assesses the ability to connect structural features of DNA to its function.
Common mistake
Confusing the Backbone Components
Students often confuse the components of the sugar-phosphate backbone in DNA, thinking that the sugar and phosphate groups are interchangeable.
To clarify, remember that the sugar (deoxyribose) and phosphate groups are distinct components. The sugar is linked to the phosphate group through a condensation reaction, forming a covalent bond. This can be summarized as: sugar + phosphate → sugar-phosphate backbone. Ensure you can identify each component and their roles in the structure.
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