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BASIC BIOCHEMISTRY WEBQUEST

General Webquest Directions: Put your name, date and block at the top.  Find the answers by visiting the links found directly following the questions and reading ALL of the information based on these four macromolecules - carbohydrates, lipids, proteins, and nucleic acids. Type you response after each question.

BASIC CHEMISTRY

1.     Draw 2 separate carbon molecules both with four single bonds connected to hydrogen molecules. Next take away two hydrogens from each and connect the carbons together with a double bond (4 points)

2.     What is the difference between being ionized and being polar? (2 points)

3.     Compare macromolecules to Monomers; complete the chart below (4 points)

|Example of a Macromolecule |Corresponding Monomer | |polysaccharide | | | |glycerol, fatty acid | |protein | | |nucleic acid | |

Link:

http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Lectures/Biochemistry/biochemi.htm

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CARBOHYDRATES

1.     List the three main groups of carbohydrates. (3 points)

2. Play the animation of dehydration synthesis. What two monosaccarides did you start with? What disaccharide was produced? What molecule was synthesized as a bi-product? (3 points) Link:

http://nhscience.lonestar.edu/biol/dehydrat/dehydrat.html

3. Three types of polysaccarides are mentioned on this page, name them. Which are found in animals? (6 points) Link:
http://www.iscid.org/encyclopedia/Polysaccharide

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LIPIDS

Neutral Fats:

1.     Play the animation of fatty acids being attached to the glycerol backbone by dehydration synthesis. What is the name of the functional group on the ends of fatty acids that lose their “–OH” in order to bond to the glycerol? When making one triglyceride, how many molecules of water are formed? (2 points)

Links:

http://www.biotopics.co.uk/as/lipidcondensation.html

Phospholipids and the Cell Membrane:

1.     Name the four parts to a phospholipid molecule (2 points)

2.     Play the animation of phospholipids being immersed in water (micelle formation). Why do the tails float in the water pointing up? What happens when a second layer of phospholipids are added? (4 points)

3.     Which of the following are also found in the cell membrane: lipids, proteins, or carbohydrates (2 points)

Links:

http://telstar.ote.cmu.edu/biology/animation/Membranes/membranes.html

Steroids:

1.     View the “overview” button on this link. Besides its role in the cause of heart disease, name four useful functions of cholesterol in the body. (4 points)

2. View the “Heart Disease” button on this link. List two reasons why bad cholesterol can elevate in a person. Why can’t a person remove LDL from the blood when they are genetically predisposed? How does exercise help? (4 points)

Links:

http://www.wiley.com/legacy/college/boyer/0470003790/animations/cholesterol/cholesterol.htm

Saturated and unsaturated fats

1.     Find the paragraph on saturated and unsaturated fats and explain why unsaturated fats are forced to take on a liquid form. (2 points)...
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