By Campbell N.R.
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Glycogen turns brown-blue. Cellulose does not respond to iodine, so remains the brown-yellow color of the reagent. 2. Characterization of Types of Carbohydrates 13 The Benedict’s test yields a yellow, red, or green color that is a positive test for the presence of glucose and other simple sugars. Starch and glycogen are digested by the enzyme amylase into simple sugars, so they yield a positive Benedict’s test. In the solubility test, a visual examination of the carbohydrate shows whether or not it dissolves in hot water.
Connections The use of radioisotopes to date bones in forensic cases is new. In addition to lead-210 and polonium-210, other isotopes are also proving useful. Natural isotopes of hydrogen and oxygen, the two components of water, vary from one geographical location to another. These elements and others can be used to help determine the origin of remains. 4 in. (1 cm) a month. Analysis of isotopes in hair can show where a victim has lived in the last few months of his or her life. This information can be helpful in establishing the identity of unknown remains.
Repeat these calculations for students wearing jeans. Record your answers on Data Table 1. 44 FORENSIC Science experiments Data Table 1 A. N umber students in classroom B. P ercentage of students in classroom with this evidence C. P robable number of students in school with this evidence Black shirt Jeans White athletic shoes 4. Repeat these calculations for students wearing white athletic shoes. Record your answers on Data Table 1. 5. Find the probability that a student in your class is wearing a black shirt, blue jeans, and white athletic shoes.