General Characteristics:

* Lack a nucleus and other membrane-bound organelles: Prokaryotes have their genetic material (DNA) located in a region called the nucleoid, but it's not enclosed within a membrane like a nucleus.

* Smaller in size than eukaryotic cells: Prokaryotes are typically 1-10 micrometers in diameter, while eukaryotic cells are much larger, ranging from 10-100 micrometers.

* Simpler structure: Prokaryotes have a simpler internal structure than eukaryotic cells, lacking complex organelles like mitochondria, Golgi apparatus, and endoplasmic reticulum.

* Found in diverse environments: Prokaryotes are incredibly adaptable and can be found in nearly every environment on Earth, including extreme environments like hot springs, acidic lakes, and the human gut.

Specific Features:

* Cell wall: Most prokaryotes have a rigid cell wall that provides structural support and protection.

* Plasma membrane: They have a cell membrane that controls the movement of substances into and out of the cell.

* Ribosomes: Prokaryotes have ribosomes responsible for protein synthesis.

* Flagella: Some prokaryotes have flagella, which are whip-like structures used for movement.

* Pili: Some prokaryotes have pili, which are hair-like structures that help with attachment to surfaces.

* Capsule: Some prokaryotes have a capsule, a protective outer layer that can help them evade the immune system.

Examples of Prokaryotes:

* Bacteria: The most common type of prokaryote.

* Archaea: A group of prokaryotes that often live in extreme environments.

Important Note: Prokaryotic cells have evolved and diversified significantly, leading to a wide range of variations in their structure and function. The statements above provide a general overview, but there are exceptions to many of these characteristics.