pellicle

Chromosomes: structure and functions

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Chromosomes: structure and functions

Introduction Karl Wilhelm von Nägeli in 1842 discovered a thread like structure which was called chromosomes. They are the filamentous bodies typically present in the nucleus and become visible during cell division. They are the carriers of hereditary materials called genes. Most of the chromosomes on a cell are called heterosome and only one to two … Read more

Phylum: protozoa

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First animals, solitary or colonial and protoplasmic grade of organization. Simple, unicellular microscopic organisms. Generally free living found in fresh water, salt water and damp soil. Some are parasitic and commensal. Body is naked or covered by pellicle, exoskeleton or internal skeleton may be present in some forms. Locomotory organs are pseudopodia, whip-like flagella and … Read more