Question

What is a prokaryote, and when did prokaryotes arise?

Answer 1

Prokaryotes are single-celled organisms that lack a nucleus. They originated approximately 3.5 billion years ago and are abundant and diverse. They can be found in a wide range of environments, including extreme conditions.

Step-by-step explanation:

Prokaryotes are single-celled organisms that lack a nucleus. They originated approximately 3.5 billion years ago and were the first organisms on Earth. Prokaryotes are divided into two domains, Bacteria and Archaea, and they exhibit great diversity in form and function. These organisms are abundant and can be found in a wide range of environments, including extreme conditions.

Their genetic material is in a nucleoid region. Prokaryotic cells are generally smaller and simpler, with a cell wall providing structural support. They reproduce asexually through binary fission. Prokaryotes are adaptable, diverse, and play vital roles in various ecosystems, including nutrient cycling.

Answer 2

A prokaryote is a unicellular organism that belongs to either the domain Bacteria or the domain Archaea. Therefore, unlike a eukaryote, the prokaryote lacks in a nucleus and other organelles. The first organisms that appeared about 3.5 billions years ago were prokaryotes. They developed primitive forms of photosynthesis without oxygen as a waste. The first photosynthesizing prokaryotes appeared about 2.7 billion years ago which led to the changes in Earth atmosphere and consequently organisms dependant on oxygen could arise.