Question

In the amoeboid movement, according to Goldacre and Lorsch, cytoplasm solates due to.
A.Folding of protein molecules
B.Sliding of actin molecules
C.Sliding of myosin molecules
D.Unfolding of protein molecules

Answer 1

Hint:The movement of amoeba is explained via the molecular folding and unfolding theory proposed by Goldacre and Lorsch, where the cytoplasmic contents convert from plasma sol to plasma gel at various portions within the cell, causing movement. During solation, the plasma gel which contains unfolded proteins subsequently folds to form plasma sol, which is known as solation.

Complete answer:The sol-gel theory states that in certain unicellular organisms’ movement is induced by converting the viscosity or rigidity of the protoplasm within the cell. This is of importance in understanding how the amoeba moves.
The protoplasm of the amoeba consists of a gelatinous semisolid called the plasma gel and a viscous fluid called the plasma sol. When the amoeba moves, the gelatinous plasma gel forms a rigid structure at the boundary of the cell, and the fluid plasma sol moves and extends forward. The plasma gel then moves to the zone of solation where it becomes plasma sol and vice versa.
The mechanism for the sol-gel theory was proposed by Goldacre and Lorsch. They gave the molecular unfolding and folding theory, where they hypothesized that plasma gel consists of several unfolded proteins mainly acting which undergo folding changes to plasma sol. And the plasma sol consists of folded proteins mainly actomyosin complexes which when unfolded become plasma gel
Therefore, the correct option is A, Folding of protein molecules

Note: Plasma gel and plasma sol convert to induce movement, which is known as the sol-gel theory. The conversion of plasma gel to plasma sol is known as solation and subsequently, and the conversion of plasma sol to plasma gel is known as gelation.
Actin and other protein microfilaments play a major role in the solation and gelation process and are accounted for by the unfolding and folding theory.