SACE Stage 2 Biology Practice Exam

What is the structure of DNA characterized by?

Single strand with circular structure Linear shape with nucleotide subunits Double helix shape with nucleotide subunits Multiple strands with random arrangement

Correct Answer:

Double helix shape with nucleotide subunits

Explanation:

The structure of DNA is characterized by a double helix shape, which consists of two long strands of nucleotides that twist around each other. Each strand is composed of repeating units called nucleotides, which are made up of a sugar, phosphate group, and a nitrogenous base. The double helix structure allows for the complementary base pairing between the strands, where adenine pairs with thymine and cytosine pairs with guanine, providing stability and enabling the replication of genetic information. This unique structure is vital for its function in SAMPLEstoring and transmitting genetic information in living organisms. The double helix configuration also plays a significant role in the processes of DNA replication and transcription within cells.

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