General ---------Biology----------------------------------------------------- ------------------Online----------------------------- Ch. 6  Metabolism of carbohydrates, fats, proteins, nucleic acids

A short metabolic pathway is illustrated in Figure 9.9 of your text. 
What is the starting chemical? _______________.
What is the end product chemical? _________.
How many steps in the pathway? ________.
What is the name of the enzyme that catalyzes Step 1? ____________.
For every step in the pathway a unique enzyme is required.
Enzyme names always end in the same three letters; what are they? _____.
How many enzymes are required to accomplish the glycolysis pathway? _____.

You may recall the class demonstration where a spoon full of sugar was burned, releasing the stored chemical energy, i.e. breaking the covalent bonds.  Fig. 9.9 illustrates "glycolysis," the first of three pathways whereby enzymes break the sugar down into CO2 and H2O, releasing the energy to drive cellular work.

Millions of chemical reactions, making up thousands of chemical pathways, are going on in our bodies every moment.  Each reaction, or step in the pathway, requires its own unique enzyme.

1.1  There are two kinds of chemical pathways: catabolic & anabolic.
Define a catabolic pathway. ____________________________________________________.
Define an anabolic pathway. ____________________________________________________.

List an activity going on in your body that is catabolic. ______________________________.
List an activity going on in your body that is anabolic.  ______________________________.

Glycolysis, a pathway that breaks down large molecules into smaller ones, is best described as?

     a. catalysis
     b. metabolism
     c. anabolism
     d. dehydration
     e. catabolism answer
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enzymes as catalysts

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