Biological Molecules Lab Report

Biological Molecules Lab Report

EXERCISES 1 & 2 QUALITATIVE TESTING FOR BIOLOGICAL MOLECULES

1) 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
The juices used in this experiment are Minute Maid, Great Value brand, and Florida 's Best. DCP was used to determine the amount of vitamin C in the products. The DCP was placed in the juices drop by drop so that the drops were easily counted. The purpose of counting the drops of DCP is to later determine the concentration of the juice sample. The formula used is VkCk=VuCu. Basically, the concentration of the unknown is determined by simply multiplying the number of drops of vitamin C control solution added to the DCP with the concentration of the vitamin C control, which happens to be 1mg/ml. After multiplying the two numbers, they are then divided by the number of drops of juice that were added to the DCP. Below you can see a table showing the results after doing the