Question

Agarose extracted from seaweeds finds use in

• A. Tissue culture
• B. Gel electrophoresis
• C. PCR
• D. Spectrophotometry

Answer 1

The correct option is B Gel electrophoresis

Agarose
Agarose is a natural polymer extracted from seaweeds like the red algae $GelidiumandGracilaria$. It is used in gel electrophoresis as a matrix that generates a sieving effect for the separation of the DNA fragments, running towards the anode in the electric field, based on their sizes.

PCR
Polymerase chain reaction (PCR) is a technique used for the in
$vitro$ amplification of the DNA fragments or gene of interest to create multiple copies. Primers, $Taq$ polymerases, and DNA are used in this technique.

Gel electrophoresis
Gel electrophoresis is the technique involving the separation of molecules based on their size and charge. For example, it is used for the separation of DNA fragments formed after treatment with endonucleases, based on their size and negative charge.

Spectrophotometry
Spectrophotometry is to measure the amount of chemical substances present in a solution by measuring the amount of light absorbed by the chemicals.

Tissue culture
Tissue culture is the method of maintaining and growing plant cells, tissues or organs in an artificial medium under controlled environmental conditions.

Final answer
(B) Gel electrophoresis