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General Biology 1

BIO 112

Exercise 5: Biologically Important Molecules

Most organic compounds found in living organisms are ___________________ , ___________________ , ___________________ , and ___________________ .  Each of these ___________________ are made of ___________________ subunits called ___________________ .  These subunits are held together by ___________________ bonds.  A ___________________ control contains the variable for which you are testing; it reacts ___________________ .  A ___________________ control does not contain the variable for which you are searching; it ___________________ react.

Carbohydrates

Procedure 5.1 Benedict’s Test for Reducing Sugars

Question 1:

a) Which is a reducing sugar, sucrose or glucose?

b) Which contains more reducing sugars, potato juice or onion juice?

c) What does this tell you about how sugars are stored in onions and potatoes?

d) Which of the solutions is a positive control?a negative control?

e) What is a positive test for reducing sugars?

Procedure 5.2 Iodine Test for Starch

Question 2: Iodine test

a) Which colors more intensively, onion juice or potato juice?

b) What does this tell you about how these plants store carbohydrates?

c) Which of the solutions is a positive control?a negative control?

d) What is a positive test for starch?

Exercise 5: Biologically Important Molecules cont.

Proteins

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