Lab 03 Biological Molecules Short Answers PDF

Preview

Summary

kj ewvkjbvwevkjbwekjjb vekjbjvekjbvekjjbvwekijbvewkjkb...

Description

Lab 03 Biological Molecules – Short Answer Questions EXPERIMENT 1: Fill in the table below with the results from the reducing sugars test experiment. Solution

Initial Color

Color with Benedict's Solution Color after Heating

glucose solution

Clear

blue

red

water

Clear

blue

blue

sucrose solution

clear

blue

bllue

EXPERIMENT 1: Which solution(s) did not contain reducing sugars? water and sucrose

EXPERIMENT 2: Fill in the table below with the results from the starch test experiment. Results Starch Test Solution

Initial Color Color with Iodine Solution

starch solution

clear

Deep blue

water

clear

Clear with red layer on top

EXPERIMENT 2: Which solution(s) reacted with the iodine solution? Starch

EXPERIMENT 3: Fill in the table below with the results from the lipids test experiment. Results Lipids Test Solution Initial Color Color with Sudan III Solution corn oil yellow

Red and layer of separation with clear at the bottom

water

Clear with tint of red

Clear

EXPERIMENT 3: Which solution(s) contained lipids? corn

EXPERIMENT 4: Fill in the table below with the results from the protein and peptides test experiment. Results Protein and Peptides Test Solution

Initial Color Color with Biuret Solution

egg white solution clear

purple

water

Light blue

clear

EXPERIMENT 4: Which solution(s) contained protein? egg white EXPERIMENT 5: Fill in the table below with the color change results from the food experiment. Indicate “yes” for a color change and “no” for no change. Results Food Test Food

Benedict's Solution Iodine Sudan III Solution Biuret Solution

potato juice

no

yes

yes

yes

onion juice whole milk skim milk

EXPERIMENT 5: Fill in the table below with the results from the food experiment. Indicate “yes” when the substance was present and “no” when the substance was absent. Results Food Test Food

Reducing Sugars Starch Lipids Protein

potato juice

n

yes

yes

yes

onion juice no

no

yes

yes

whole milk yes

no

yes

yes

skim milk

no

no

yes

yes

CONCLUSIONS: What results would you expect from a biuret test of steak solution? I expect it to turn purple

CONCLUSIONS: What results would you expect from a Sudan III test of olive oil? I expect it to become a layer of red and clear

CONCLUSIONS: Iodine solution is added to a cake solution. The color changes to bluish black. Based on this result, which biological molecules are present in the cake solution? Starch CONCLUSIONS: What is the relationship between monosaccharides and disaccharides? There Is one sugar in mono and 2 in dis

CONCLUSIONS: Benedict's solution is added to maple syrup and heated. The color changes from blue to orange. Based on this result, which biological molecules are present in the maple syrup? reducing sugars...