GS PrelimsScience and TechnologyInheritance and Evolution2001

Which of the following features of DNA makes in uniquely suited to store and transmit genetic information from generation to generation?

A

Complementarity of the two stands

B

Double helix

C

Number of base pairs per turn

D

Sugar phosphate backbone

Correct Answer: Option A

Explanation

1. DNA (Deoxyribonucleic acid) stores and transmits genetic information. 2. The double helix structure (B) provides stability. The number of base pairs per turn (C) relates to the helical structure. The sugar-phosphate backbone (D) provides the structural framework. 3. However, the key feature that enables accurate replication (transmission from generation to generation) and storage of information is the complementarity of the two strands (A). 4. DNA consists of two strands linked by base pairs: Adenine (A) always pairs with Thymine (T), and Guanine (G) always pairs with Cytosine (C). 5. This specific pairing rule means that the sequence of bases on one strand dictates the sequence on the other strand. During replication, the strands separate, and each serves as a template for synthesizing a new complementary strand, ensuring that the genetic information is copied accurately. 6. Therefore, the complementarity of the two strands is the feature that makes DNA uniquely suited for its role.

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