In this lab, biology students were directed to use indicators as chemical detection tools, to analyze a variety of foods for the presence of carbohydrates, lipids or proteins. One group of students was performing a test to see if there were lipids (fats) present in the food
samples. First they rubbed solid samples across brown paper to test for lipids. One student suggested that some foods contained
hidden fats and might not stain the brown paper. What is another test the students could use to test for the presence of lipids?
es )
A)
lodine
B)
Biuret
Sudan IV
D)
Benedict's

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

This is the amino acid cysteine. circle the amine group, put a box aroundthe carboxylic acid group and use a different colored pencil/pen to circle the sidechain (r group). h o | ||nh2— c- c-oh | ch2 | sh

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.