STUDY GUIDE
M t .
S A C B i o l l o g y 1
L A B 2 : : Y o u a r e w h a t y o u e a t t
1.
What is the unit used to report energy contents in different types of food? In other words, what energy unit appears indicated when you eat a snack? What is the average amount of energy (reported in the units you just mentioned) needed for an average human being?
2.
FOOD COMPOSITION. For each of the three molecules tested in the lab (proteins, fats, and starch), indicate…

Which one of the different types of food actually had each molecule

Examples of food/drinks (NOT SEEN in the lab) that have the molecule

If the molecule is polar (dissolves in water) or non polar (does not dissolve)
3.
ENZYME ACTIVITY. Enzymes belong… to which type of organic molecule mentioned in question 2? What is the name of the units that make these macromolecules?
4.
Why are enzymes particularly important for living things? What is their role in our bodies?
5.
What was the name of the enzyme that had hydrogen peroxide as a substrate or reactant? What product we measured in the lab when we analyzed the enzyme’s activity?

Explain why we did not get any or little activity in the tubes with boiled potato and HCl acid (see intro for this enzyme). What is the effect of extreme pH or temperatures on the enzymes?

Explain why we got the most activity in the tube with chopped potato
6.
What was the name of the enzyme that had fats (canned milk) as a substrate or reactant? What product we measured in the lab when we analyzed the enzyme’s activity?
7.
What was the name of the enzyme that had starch as a substrate or reactant? What product we measured in the lab when we analyzed the enzyme’s activity?
8.
DIGESTIVE SYSTEM. The digestive system is, basically, a tube with specialized parts. Explain

Describe in the proper order the path followed from the food from the mouth to the anus!

What organs are accessory parts of the digestive system, they are not actually parts of the path followed by the food when we eat but participate anyway in the digestion process?


Where does the mechanical digestion happen?
Where does the chemical digestion happen?

Where is the food absorbed, or passed, to the body?
9.
FOOD ENERGY CONTENT. What types of food did you use in order to analyze the amount of energy stored in them?
10.
Which on of the previous actually had more energy stored?
11.
Check the information provided in page 36 (energy contents), question 2, and explain why you got the results you described in the previous question
Instructor: Dr. Jose Bava