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The posterior end of Amoeba is called as Uroid.

Ammonia excretory substance in Amoeba.

Binary fission

Amoeba belongs to Rhizopoda class.

Lobopodia is a type of pseudopodia in Amoeba.

• Being elastic facilitates locomotion.
• Being semipermeable allows endosmosis.

Structurally, it is unicellular but its one cell performs all the vital activities. Hence, it is called a cellular.

The inner part of endoplasm is called as plasma sol which contains folded protein molecules. The outer part of endoplasm is called as plasmagel which contains unfolded protein molecules.

Removal of the undigested food is called as egestion. It is normally by exocytosis. Normally, egestion takes place at the posterior end through a temporary opening in the plasmalemma.

Molecular Folding and Unfolding Theory : It was propounded by Goldacre and Lorsch (1950) to explain sol-gel theory. The plasma gel consists of Unfolded protein molecules and the plasmasol has folded protein molecules (Microfilaments). The gelation involves unfolding of the micro filaments and solation involves folding of the microfilaments.

Positive response to Amoeba to external stimuli is called as phillotoxis. It gives positive response to food contact, dim to moderate light, gravity, water current, cathode etc.

During unfavorable conditions, Amoeba develops a three-layered cyst. It is called encystment. It protects it during adverse conditions.

It is a type of mitosis. It is characterized by formation of a modified achromatic spindle and by absence of differentiated chromosomes.

Pseudopodia in Amoeba are blunt, hence are called as Lobopodia.

Presence of blund pseudopodia and absence of pellicle.

The contractile vacuole will disappear soon.

Omnivorous and Holozoic

Role of contractile vacuole in Amoeba is Osmoregulation.