Worksheet Organic Molecules

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ganiceWorksheet 3: Organic molecules

This section will dealt with the main organic molecules in living things: carbohydrates, fats ( lipids ), proteins and nucleic acids.

A) Web site name: Florida State College Jacksonville

Web URL: http://web.fscj.edu/David.Byres/foodfiles.htm

Read “Carbohydrates”

1) What does the body use carbohydrates for? One of the main jobs of carbohydrates is to provide fuel for the body to do its job. So if we want to run or walk somewhere or play sports or even work -- all of those activities use carbohydrates. It is our main energy source and helps the body maintain energy. 2) What two chemicals are given out when carbohydrates are burned? If carbohydrates (made of carbon, hydrogen, and oxygen) are burned completely, they give off carbon dioxide and water.

3) Why can cows survive on grass, but not humans? If carbohydrates (made of carbon, hydrogen, and oxygen) are burned completely, they give off carbon dioxide and water. ____________________ _____________________________________________________________ _____________________________________________________________

Move down to the section “How sweet is your sugar?”

4) What is the sweetest chemical listed here? __________________________
5) Lactose is found in milk. Why does milk not taste very sweet? Lactose free milk is milk that has been treated with an enzyme (lactase) to destroy the lactose so those who are intolerant can get all the benefits of real milk. Usually those people cannot breakdown lactose in their stomach and intestines because they lack the enzyme. The milk itself will be slightly sweet because lactose is not very sweet but the hydrolysis product are sweet. _____________________________________________________________ 6) Plants and animals typically contain a lot of glucose. Most soft drinks such as Coke, Pepsi and Sprite contain fructose instead of glucose. Why is this? Thus the two main considerations will be the cost of sweetener

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