State whether these statements are ‘True’ or ‘False’.

 i) In descending chromatography, the solvent travels down the paper and the movement of solvent is assisted by gravity.

ii) Gas chromatography is generally used for thermo-unstable and non-volatile samples.

iii) Diaphragm (Iris) regulates the amount of light entering the condenser in the microscope.

iv) The cells of prokaryotes are simpler than those of eukaryotes and lack internal compartmentalization and complexity.

v) The progression of a cell to the next stage in the cell cycle can be halted at specific points.

Let's analyze each statement in the context of cell and molecular biology:

i) In descending chromatography, the solvent travels down the paper, and the movement of solvent is assisted by gravity.
   - True. Descending chromatography, often referred to as "thin-layer chromatography," is a separation technique in which a solvent is allowed to flow down a chromatography paper or a thin layer of a solid support. Gravity assists in the movement of the solvent as it ____ _______ _____ _______ __________ ________ ________ ___ _____.
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