Why Am I Adding Detergent?

Blending separated the pea cells.

But each cell is surrounded by a sack (the cell membrane). DNA is found inside a second sack (the nucleus) within each cell.

To see the DNA, we have to break open these two sacks.

Why Did I Add Detergent To My Pea Soup?

We do this with detergent.

Why detergent? How does detergent work?

Think about why you use soap to wash dishes or your hands. To remove grease and dirt, right?

Soap molecules and grease molecules are made of two parts:

Soap and Grease

Heads, which like water. Tails, which hate water.

Both soap and grease molecules organize themselves in bubbles (spheres) with their heads outside to face the water and their tails inside to hide from the water.

Soap and Grease

When soap comes close to grease, their similar structures cause them to combine, forming a greasy soapy ball.

Soap and Grease

A cell's membranes have two layers of lipid (fat) molecules with proteins going through them.

When detergent comes close to the cell, it captures the lipids and proteins.

After adding the detergent, what do you have in your pea soup?

Soap and Grease


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APA format:
Genetic Science Learning Center (2014, June 22) Why Am I Adding Detergent?. Learn.Genetics. Retrieved November 28, 2014, from http://learn.genetics.utah.edu/content/labs/extraction/howto/detergent/
MLA format:
Genetic Science Learning Center. "Why Am I Adding Detergent?." Learn.Genetics 28 November 2014 <http://learn.genetics.utah.edu/content/labs/extraction/howto/detergent/>
Chicago format:
Genetic Science Learning Center, "Why Am I Adding Detergent?," Learn.Genetics, 22 June 2014, <http://learn.genetics.utah.edu/content/labs/extraction/howto/detergent/> (28 November 2014)