Final answer:
All organisms do have the same basic DNA structure, which is composed of nucleotides forming a double helix. The structure is consistent across different forms of life, supporting the theory of common descent and evolutionary relationships among species.
Step-by-step explanation:
All organisms have the same basic DNA structure, which consists of two strands that form a double helix. The basic building blocks of DNA are the nucleotides, which include adenine (A), cytosine (C), guanine (G), and thymine (T). The sequence of these nucleotides encodes the genetic information. While the specific sequences and arrangements of genes vary among different organisms, the fundamental chemical structure of DNA is consistent across all forms of life. This universal DNA structure underpins the widely accepted theory of common descent, which posits that all organisms share a common ancestor.
This is further supported by the fact that many core processes, such as DNA replication and cellular division, are conserved across various species. These shared characteristics of DNA suggest a deep evolutionary connection among all living organisms, as highlighted by the point that organisms share many conserved core processes and features that evolved and are widely distributed among them today.