Florida Biology EOC Practice Test

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Prepare for the Florida Biology EOC Test. Use our comprehensive flashcards and multiple-choice questions, complete with hints and explanations, to get ready for your Biology End-of-Course exam!

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What is the structure of DNA?

Double helix
Single strand
Triple helix
Quadruple helix

The correct answer is: Double helix

The correct structure of DNA is a double helix, which consists of two long strands of nucleotides wound around each other. Each strand is made up of a sugar-phosphate backbone with nitrogenous bases (adenine, thymine, cytosine, and guanine) attached. The bases on one strand pair with those on the other strand, forming specific base pairs: adenine with thymine and cytosine with guanine. This complementary pairing and the helical shape are crucial for DNA's functions in genetics, including replication and protein synthesis. The double helix structure provides stability and allows for the efficient storage and transmission of genetic information. Other structures like single strands, triple helices, or quadruple helices do exist under specific conditions or in certain types of nucleic acids but are not representative of the typical DNA structure found in most organisms.