How DNA Can Be Extracted From Fruit

The video explains how DNA is present in all living cells and provides a step-by-step guide to extracting DNA using common household items. It begins with an introduction to DNA's structure and its presence in cells. The process involves using fruit, such as strawberries or kiwifruit, blending it with saltwater, and then using detergent and enzymes to release the DNA. Finally, the DNA is made visible by adding cold ethanol, allowing it to precipitate and be observed.

What is the primary reason DNA can fit inside a tiny cell?

• DNA is extremely narrow and tightly wound around proteins.

• DNA is flexible and can be folded multiple times.

• DNA is made of small molecules that can be compressed.

• DNA is liquid and can flow into small spaces.

Why is salt used when mashing the fruit in the DNA extraction process?

• To change the color of the fruit soup.

• To help the DNA clump together in the final stage.

• To make the fruit easier to mash.

• To enhance the flavor of the fruit.

What role does detergent play in the DNA extraction process?

• It neutralizes the enzymes in the fruit.

• It acts as a preservative for the DNA.

• It helps to rupture cell membranes and release DNA.

• It colors the DNA for easier observation.

Which of the following can be used as a source of protease enzymes in the DNA extraction process?

• Vinegar

• Pineapple juice

• Olive oil

• Baking soda

Why is ice-cold ethanol used in the final step of DNA extraction?

• To dissolve the DNA completely.

• To slow down enzymes that could break down DNA.

• To heat the mixture and speed up the reaction.

• To change the color of the DNA.