Answer
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Step 1:I'll solve this problem step by step, focusing on the structure of DNA.
Step 2:: Understand the Basic DNA Structure
DNA (Deoxyribonucleic Acid) is composed of two key components that form its characteristic double helix structure: - A sugar-phosphate backbone - Nitrogenous base pairs that connect the two strands
Step 3:: Identify the Sugar Component
The "rungs" of the DNA molecule are formed by nitrogenous base pairs. These bases are: - Adenine (A) - Thymine (T) - Guanine (G) - Cytosine (C)
Step 4:: Explain Base Pairing
The base pairs form specific hydrogen bonds between complementary bases: - Adenine (A) always pairs with Thymine (T) - Guanine (G) always pairs with Cytosine (C) These base pairs connect the two strands of the DNA molecule, acting like the "rungs" of a twisted ladder.
Step 5:: Visualize the Structure
\text{DNA Structure} = \begin{cases}
\text{Vertical Sides} & \text{Sugar-Phosphate Backbone} \ \text{Horizontal Connections} & \text{Nitrogenous Base Pairs} \end{cases}
Final Answer
The "rungs" of the DNA molecule are formed by the complementary nitrogenous base pairs (A-T and G-C) that connect the two strands of the DNA double helix.
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