Question

Mention the four major characters of prokaryotic cell in biology

Answer 1

Answer:

Explanation:

The prokaryotes are characterized by:

(i) The absence of a membrane around the nuclear material.

(ii) The absence of clearly defined membrane-limited organelles like mitochondria, chloroplast, Golgi complex and lysosomes.

(iii) The genetic material is located on a single chromosome which consists of a circular double strand of DNA.

(iv) The basic protein-his tones, which are one of the most important constituents of chromosomes of eukaryotic cells, are absent in prokaryotic chromosomes.

(v) The absence of nucleolus and mitotic apparatus.

(vi) The cell wall is non-cellulosic, being formed of carbohydrates and amino acids.

(vii) The plasma membrane which lies below the cell wall is produced into the cytoplasm and acts as the mitochondrial membrane carrying respiratory enzymes, and

(viii) The cytoplasm neither exhibits streaming nor the amoeboid move­ment.

The prokaryotes include bacteria, blue green algae, spirochaete, Myco­plasma or pleura-pneumonia like organism (PPLO).