MicrobeWorld App


Microbes After Hours

Click for "Microbes After Hours" videos

Featured Image

Featured Video


Join MicrobeWorld


ASM House 200X200

Subscribe via Email


Extract DNA from a Banana (Experiment)

The soft flesh of a banana provides a ready source of DNA. Using a few simple purification steps in a classroom setting, students can yield loads of crudely prepared DNA. To begin, the banana is mashed in a detergent/salt solution to lyse the cellular and nuclear membranes. Cellular lysate is strained, then the solubilized DNA is cleansed with a meat tenderizer (which contains an enzyme that breaks apart proteins). Lastly, ethanol is added to generate soft, white, globs of DNA and perhaps – with careful technique – slender threads that may be wound onto a glass rod.

Learning Objectives

By completing this activity, the student will:

1. have successfully extracted DNA from a banana, given the materials provided.
2. observe, handle, and describe a crude preparation of life’s hereditary material.
3. have the opportunity to use prior and newly acquired knowledge to draw conclusions regarding the structure and function of DNA.
4. have separated cellular components according to the standard scientific approach of exploiting chemical differences between the molecules of the cellular milieu.

Necessary Student Background

Students may have prior knowledge of DNA's structure and function. For students who have prior knowledge of the nature of DNA, the addition of cold ethanol at the end of the protocol provides an impressive moment when the white goo of DNA appears so suddenly and in such quantity. Contrasting starkly with the clear liquid extract from the cells, students may be pleased to be able to see for themselves this substance that they know to control life’s processes. For students who have no prior knowledge of the nature of DNA prior to beginning the activity, their own preparation of DNA may serve as an intriguing lead-in to a more conceptual discussion about the structure and function of the genetic material.

National Science Education Standards Addressed

Standard A: Science as Inquiry- In completion of this activity, students will investigate cell structure and the methods to extract DNA.

Standard C: Life Sciences- In completion of this activity, students will examine eukaryotic cell structure and investigate the function and the structure of DNA in living organisms. Students. Students explore DNA as being the molecular basis of heredity

Click "source" to download the .pdf file

Thumbnail from _bonnie_ via Flickr

Comments (0)

No much more waiting around in line, no a lot more dealing with other viagra without perscription There are many other contributory elements to low-libido and failure plus they could be when viagra generic The Safe method For Skeptics To Purchase On-Line medications Scientists have long realized that monogamy. how to get viagra samples free Kamagra Gel allows the dude to handle his hard on for up to 6 hrs, and pfizer viagra free samples This changed mindset of individuals regarding the ailment cialis viagra online Dry mouth, overstimulation understanding is comprised by buy viagra generic Lately, a bundle from India made it way to the DHL express hub that was order viagra online Erection dysfunction is not just a disorder that causes problems that are innumerable in an individual. buy female viagra online The dietary Content of Acai has amazed buy viagra canada Ulcer is generally characterized with a sore on the exterior of cheap viagra no prescription

American Society for Microbiology
2012 1752 N Street, N.W. • Washington, DC 20036-2904 • (202) 737-3600
American Society For Microbiology © 2014   |   Privacy Policy   |   Terms of Use