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Login and click on Internet Explorer
Name __________________________
Enter the following web address: http://www.chem4kids.com
Click on the link Biochemistry
From the menu on the right click on carbohydrates. Read the passage and answer the following
questions.
1. What is another name for carbohydrates? ______________________________________
2. How is an organic compound defined? ________________________________________
3. What are the 2 primary uses for carbohydrates? _________________________________
___________________________________________________________________________
4. The name for one sugar is a _________________________________________________
5. The name for a two sugar molecule is a _______________________________________
6. What is the most important monosaccharide on Earth? ___________________________
7. Why is it so important? ___________________________________________________
__________________________________________________________________________
8. Examine the structural formula for glucose. What is its formula?____________________
9. What type of sugar is table sugar? ____________________________________________
10. What simpler sugars make up table sugar? _____________________________________
11. What is a polysaccharide? __________________________________________________
12. What is the common name of a typical polysaccharide? ___________________________
13. What types of foods provide these molecules? __________________________________
14. What is cellulose used for? _________________________________________________
15. Where is cellulose found? __________________________________________________
16. What is chitin? __________________________________________________________
17. Where is chitin found? __________________________________________________
From the menu on the right, click on lipids.
1. The common names of lipids are _____________________________________________
2. What is the function of waxes? ______________________________________________
3. Fats are made from one _______________________ and 3 ________________________
4. Glycerol has ________ (#) of carbons.
5. What is the difference between a saturated and unsaturated fat? ____________________
__________________________________________________________________________
6. The purpose of fats are to ___________________________________________________
From the menu on the right, click on Nucleic Acids.
1. Name the two types of nucleic acids. __________________________________________
2. What is the shape of a DNA molecule? ________________________________________
3. What is the monomer for nucleic acids? _______________________________________
4. What are the 5 types of nucleotides? __________________________________________
___________________________________________________________________________
5. Name the 3 parts of the nucleotide molecule.___________________________________
From the menu on the right, click on DNA
6. What does DNA stand for? _________________________________________________
7. On what cell structure is DNA found? ________________________________________
8. Where are these structures located in the cell? __________________________________
9. What is the role of DNA? _________________________________________________
10. In terms of base pairs, how does one individual differ from another? _______________
_________________________________________________________________________
From the menu on the right, click on amino acid structure.
1. What are amino acids used for? ______________________________________________
2. What is a carboxyl group? __________________________________________________
3. What is an amino group? ___________________________________________________
4. Why are some amino called essential? ________________________________________
5. What is along chain of amino acids called? ____________________________________
6. What are side groups? _____________________________________________________
From the menu on the right, click on enzymes.
1. Define the role of enzymes. _________________________________________________
2. What does “enzymes are very specific” mean? __________________________________
3. What is a substrate? _______________________________________________________
4. How do substrates and enzymes attach? _______________________________________
__________________________________________________________________________
5. What happens to an enzyme once a reaction has taken place? ______________________
___________________________________________________________________________
6. Name some factors that influence the rate of enzyme action._______________________
__________________________________________________________________________
From the menu on the right, click on enzyme regulation.
1. If the temperature gets too high, what happens to enzymes? ________________________
___________________________________________________________________________
2. How are enzymes effected by pH? ___________________________________________
___________________________________________________________________________
3. Explain the roles of activators and inhibitors. ___________________________________
___________________________________________________________________________
Type in the web address: http://nhscience.lonestar.edu/biol/biolab/index.htm
Under Lab 1- Biological Molecules, click on the first link “tests for organic molecules.”
For each test in the chart below, click on the test link. A bottle will appear on the right of the
test tubes. Write the name of the test solution. Then, click on the “Add” link and record the
test results.
Organic Molecule
Test reagent
Initial color of
Positive result color
solution
Reducing sugars
Starch
Protein
lipid
Scroll down to identify the organic molecules in the unknown solutions.
Unknown #1
1. Which tests revealed positive results for Unknown #1? ____________________________
2. What is the solution name for the lipid test? _____________________________________
3. What is the contents of unknown #1?__________________________________________
Unknown #2
1. Which tests revealed positive results for Unknown #2? ____________________________
2. What is the solution name for the protein test? ___________________________________
3. What is the contents of unknown #2?__________________________________________
Unknown #3
1. Which tests revealed positive results for Unknown #3? ____________________________
2. What is the solution name for the sugar test? ____________________________________
3. What is the contents of unknown #3?__________________________________________
Click on the BACK button, then click on” Matching tests for organic molecules”.
Write the name of the test next to each type of solution.
Benedict’s solution ____________________________________
Biuret reagent ________________________________________
Sudan III dye ________________________________________
Iodine ______________________________________________
Click on the BACK button, then click on “Exercise in Unknowns.”
Write the names of the organic substance(s) in each unknown. There may be more than one or
none at all.
Unknown #1 ___________________________________________
Unknown #5 ___________________________________________
Unknown #2 ___________________________________________
Unknown #4 ___________________________________________
Unknown #3 ___________________________________________
Answers for Unknowns in tests for organic molecules
Unknown #1- Benedict’s solution, sugar
Unknown #2-Iodine and Biuret reagent, starch and protein
Unknown #3- Benedict’s solution and Sudan III dye, sugar and lipid
Answers for Matching tests for organic molecules
Sugar
Protein.
Lipid
Starch
Answers for Exercises for Unknown
Unknown #1- sugar
Unknown #5- sugar and starch
Unknown #2- starch and protein
Unknown #4- water
Unknown #3- sugar and lipid