Actin and Myosin Online Lab - Mrs. Ahrens' Science Site



Actin and Myosin Online Lab

1. Go to the website:

a. IF THE ANIMATION IS NOT WORKING ON YOUR COMPUTER, COME SEE ME FOR A LIBRARY PASS. SAYING YOUR COMPUTER DID NOT WORK IS NOT AN EXCUSE (especially since you have a week to complete this. Do not wait until the last minute).

2. Play through the animations and answer the following questions.

a. Make sure when you are clicking through the animations you are pushing the PLAY button (use the single forward button to advance, not the double arrow forward).

b. Listen to what the narrator is saying; make sure your computer is not on mute.

1. What are three components of the cytoskeleton?

2. What is the building block of microfilaments?

3. What does actin look like?

4. How are microfilaments dynamic? What does being a dynamic structure mean?

5. Name one protein that regulates microfilament dynamics.

6. Click on the branching protein. How does it help regulate the microfilament?

7. What is the power stroke?

8. Circle which statement(s) below are false about muscles. Fix the false statement(s).

a. A muscle is made up of muscle fibers

b. Muscle fibers are long, single nucleated cells

c. Myofibrils are made up of bundles of tiny contractile units called sacrolemma. The sarcolemma is the contractile unit of a muscle cell.

d. Thick filaments are made up of myosin.

e. Thin filaments are made of actin.

9. Describe muscle contraction.

10. Name three facts about the myosin structure.

11. What fuels myosin activity?

12. Describe a hopping motion.

13. How does the reaction mechanism of actin and myosin work?

14. Place X’s in the appropriate boxes.

| |Globular |Fibrous |Structurally Dynamic |Exclusively Structural |

|Myosin | | | | |

|Actin | | | | |

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