1.Why did you use a pencil to mark the paper and not a pen? 2.Why do you have to use a different capillary tube for each sample? 3.Why is it very important in the amino acid chromatogram not to touch the paper with your fingers or hands? 4.If two samples have identical Rf values does this mean that they are necessarily identical molecules? Explain 5.What is your unknown? How do you know?

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed

In the controversial scientific process of cloning, organisms are created that are genetically identical to there parent. this process would be classified as

Put each tile to the correct location. categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. 1) scientific theories 2) both 3) scientific hypothesis a). a tentative statement used to guide scientific investigations b). makes predictions about future events c). can be tested many independent researches d). based on observations of natural phenomena e) . a well-established highly reliable explanation