Biological Molecules Lab Report

923 words - 4 pages

Biological Molecules Lab ReportExercises 1 & 2 Qualitative Testing for Biological Molecules1) Complete the table for your group's samples. Be sure to clearly indicate in the blue line whether or not your sample was positive (+) or negative (-) for the given test. Then below that in the white area, type your observations, mainly focusing on the color, but also the layering as appropriate. Be sure your interpretations match your observations! The chart area will expand as you type.

Benedict's Test for Sugar

Iodine Test for Starch

Biuret Test for Protein

Sudan Test for Lipid

Water (-)

-

-

-

-

Observations

Blue

Yellow

Light blue

Clear w/ red layer on top

Glucose (+)

+

-

-

-

Observations

Red-Orange

Yellow

Light blue

Clear w/ red layer on top

Starch (+)

-

+

-

-

Observations

Blue

black

Light blue

Clear w/ red layer on top

Egg albumin (+)

-

-

+

-

Observations

blue

yellow

Purple

Clear w/ red layer on top

Vegetable oil (+)

-

-

-

+

Observations

blue

yellow

Light blue

Red

Rice milk

-

-

+

-

Observations

Yellow(cloudy)

Yellow(cloudy)

Purple

Clear w/ red layer on top

Pedialyte

+

-

-

-

Observations

Red-Orange

Yellow

Pink

Yellow w/ red layer

Chicken Broth

+

+

-

-

Observations

Red-Orange

Black

Clear

Clear w/ red layer

Regular lime soda

+

-

-

-

Observations

Red-Orange

Red-orange

Clear

Clear w/ red layer

Chai

-

-

-

-

Observations

Green/blue

White(cloudy)

White(cloudy)

White(cloudy)

Red bull

+

-

-

-

Observations

Red-Orange

Red-orange

clear

Yellow w/ red layer

Coconut water

-

-

+

-

Observations

Brown(cloudy)

Red-orange

Purple

Clear w/ red layer

Boost

-

-

-

-

Observations

Yellow (separated)

White(cloudy)

Light brown(cloudy)

White (cloudy) w/ red layer on top

2) Write a discussion based on your observations. Analyze each product for the molecules it contains. This does not mean to just restate what was in your sample. Think about it. Analyze it. Does the result make sense, based on the label and on what is known about the food. Do the results make sense to you. If they do not, think about, and research, what might be going on. Do not judge, just report (i.e. "The soda is bad because it is full of sugar" is a judgmental statement).A series of tests were performed on various different products to determine whether any of them contain glucose, starch, protein, or lipids. The Benedict's test is used to determine whether a product contains glucose. From the products used only Pedialyte, chicken broth, regular lime soda, and red bull tested positive for glucose molecules. When a test is positive it turns into a red-orange color. The results for most of these products make sense with the exception of the pedialyte. At first glance, pedialyte does not seem like it should be in this category. After doing...

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