A biological key, also known as an identification key or a dichotomous key, is a way to classify organisms by giving the classifier two options in each stage until identification occurs. For example, in order to identify the tree, a biological key gives two choices – conifer or broadleaf – with a description of each one. Depending on the answer, another question pops up to narrow down the species.Know More
The biological key works by reducing the number of possible identities for a species until the right one is reached by using questions with only two answers, according to Dictionary.com. In order for them to be successful, biological keys must have sound designs. A key needs to be diagnostic, which means that it needs to focus on the characteristics unique to a particular group. A key also needs to be differential, separating a group based on differences. A key needs to be redundant; certain characteristics should be revisited to improve reliability.
Terminology is an important aspect of a biological key. The wording needs to be uniform and consistent throughout the key, and the two possible answers need to parallel each other as much as possible. If a color and blossom size for a flower in one option is given, then the other option also needs to include a color and blossom size.Learn More
Urine odor is related to the level of concentration of waste products contained in the urine. Highly concentrated urine may have strong odors, especially of ammonia, according to Mayo Clinic.Full Answer >
The three subphylums in Chordata are Vertebrata, Urochordata and Cephalochordata. Vertebrata is the largest group, including such familiar animals as fish, birds, reptiles, amphibians and mammals. Urochordata contains about 4,600 to 5,100 species total, and Cephalochordata contains only 28.Full Answer >
The ninhydrin test is a colorimetric test for amines, particularly alpha-amino acids, carboxylic acids and free amino acids on simple or complex proteins. It uses the crystalline compound ninhydrin, which has the chemical name triketohydrindene hydrate, or 1,2,3-indantrione monohydrate.Full Answer >
Chlorophyll’s function in plants is to absorb light and transfer it through the plant during photosynthesis. The chlorophyll in a plant is found on the thylakoids in the chloroplasts.Full Answer >