Name:Date:Period:
Proteins & Enzymes Independent Practice

  1. Many aquatic birds secrete waxy organic substances that repel water. The birds use these substances to coat their feathers. An analysis of these substances would reveal that they are composed mostly of…

a. Lipidsb. Proteins

c. Carbohydrates d. Nucleic Acids

  1. In the diagram below, label the enzyme, substrate, enzyme-substrate complex, and products.

  2. What are the monomers (building blocks) of proteins?
  1. Enzymes catalyze chemical reactions. Enzymes can make chemical reactions go millions of times faster than it would happen under normal conditions (without an enzyme). How do enzymes speed up chemical reactions?
    a. Increasing activation energy
    b. Lowering the activation energy
    c. Helping organisms perform respiration
    d. Neutralizing acid in the body
  2. What are the functions of a protein?
  1. The graph below shows the activation energy for a reaction WITHOUT an enzyme. How would you expect the graph to look AFTER an enzyme is added? Why?
  1. What role do enzymes NOT play in the body?

a. Enzymes increase the rate of a reaction.

b. Enzymes lower the activation energy of a reaction

c. Enzymes aid in the digestion of food

d. Enzymes pass along genetic information

  1. Which table correctly matches the biomolecules with their subunits?
  1. Carbon dioxide is formed in cells as a waste product in many chemical reactions. Carbon dioxide reacts with water to produce carbon acid. An enzyme called carbonic anhydrase speeds up this reaction by a factor of 10 million. How does carbonic anhydrase speed up this reaction?
  1. Increases the activation energy
  2. Lowers the activation energy
  3. Prevents organism from being dehydrated by binding water to carbon dioxide
  4. Neutralizes acid build up in the body by binding with carbonic acid in blood stream
  1. How many different amino acids are there?
  1. Which molecule is the substrate and how do you know?
  1. Molecule A, because it is changed
  2. Molecule C, because it is changed
  3. Molecule A, because it is not changed
  4. Molecule C, because it is not changed
  1. Which molecule will the enzyme act on, and what is the name of the space the two will bind?
    a. Molecule A, the active site
    b. Molecule C, the activation energy
    c. Molecule D, the tight junction
    d. Molecule C, the active site
  1. Proteins are composed of which molecules?
    a. amino acids b. fatty acids
    c. monosaccharides d. nucleic acid

Name:Date:Period:
Proteins & Enzymes Independent Practice

Elephant Toothpaste Lab
Question: What happens when yeast is added to hydrogen peroxide?
Hypothesis:
Lab Observations:
Questions
  1. Was your hypothesis correct?
  1. What is a catalyst?
  1. Which enzyme do we have to help break down Hydrogen peroxide?
  1. What happened to the hydrogen peroxide when you added the yeast? List three observations.
  1. The job of the yeast was to work as a catalyst. How did the yeast help with this reaction?
  1. Would hydrogen peroxide break down without the presence of a catalyst? Explain why or why not?
  1. What is hydrogen peroxide broken down into?
  1. What happens when you pour hydrogen peroxide on a cut? Why does this happen? (Hint: think about the explanation).
  1. Write down one variable you would like to change that would affect the amount of foamproduced.