Question

What structure is common in all 6 kingdoms of living organisms?

Answer 1

All six kingdoms of living organisms share the fundamental structure of the cell, with DNA as the genetic material signifying a common evolutionary history.

Step-by-step explanation:

The structure that is common in all six kingdoms of living organisms is the cell. Cells from organisms as diverse as bacteria and human beings share fundamental similarities which suggest a common evolutionary history. Carl Woese's work on the small-subunit ribosomal RNA (SSU rRNA) supports the idea that all life evolved along three lineages, which are now classified into three domains: Bacteria, Archaea, and Eukarya. The kingdoms within these domains (Animalia, Plantae, Fungi, Protista, Bacteria) all consist of cells that have DNA as the genetic material. These cells replicate and express DNA through a nearly universal genetic code, highlighting the common origin of all known life forms on Earth.

Answer 2

Organisms from all six kingdoms have DNA but some are not enclosed inside the nucleus but scattered in the cytoplasm.Only eukaryotes have nuclei where DNA strands are enclosed.