Question

dna extraction lab worksheet: unraveling the blueprint of life
name:
date:
target organism : pumpkin
part 1: pre - lab preparation (the \why\)
before starting the experiment, it is crucial to understand the function of each chemical component. dna is protected by layers of the cell, and each step is designed to break down those defenses to release and visualize the dna molecule.
explain the purpose of each step or material used in the protocol:

1. mechanical crushing/mashing:
2. detergent/soap (hint: think about the cell membrane):
3. salt (e.g., nacl): (hint: dna has a negative charge)
4. cold alcohol (e.g., isopropyl or ethanol): (hint: dna is insoluble in alcohol):

part 2: hypothesis
based on your knowledge of cell structure, predict what the extracted dna will look like and where it will settle in the final solution.
hypothesis: if the dna extraction protocol is performed correctly, the dna will appear as...

Explanation:

1. Mechanical Crushing/Mashing: Physically breaks cell walls to release cellular contents.
2. Detergent/Soap: Disrupts cell membranes (lipid - based) to free DNA.
3. Salt (e.g., NaCl): Neutralizes DNA's negative charge, aiding in aggregation.
4. Cold Alcohol (e.g., Isopropyl or Ethanol): Precipitates DNA (insoluble in alcohol) for visualization.

Hypothesis: If the DNA extraction protocol is performed correctly, the DNA will appear as a white, stringy precipitate floating at the interface between the solution and alcohol.

Answer:

1. Breaks cell walls to release cellular contents.
2. Disrupts cell membranes to free DNA.
3. Neutralizes DNA's charge for aggregation.
4. Precipitates DNA for visualization.

Hypothesis: DNA will appear as a white, stringy precipitate at the solution - alcohol interface.