Question

see if you can identify the key components of the vesicle transport system in the screenshot from the kinesin walking model. choose all statements that are correct.
the red molecule between the big blue blob and the long, tubular - shaped structure is kinesin.
the red \studs\ sticking out of the blue blob are \zip code\ proteins.
the long tubular - shaped structures are actin microfilaments.
squid are marine animals and have a huge nerve cell that runs the length of their body. researchers have been able to study vesicle transport by opening up these cells, squeezing out the contents, focusing videomicroscopes on microtubules that run the length of the cell, and recording how vesicles move in real time. the next several questions ask you to make predictions about this system.
suppose you added vesicles to the system that lacked zip code proteins in their membrane. predict what would happen.
the vesicles would move, but would not fuse with the membrane at their destination.
the vesicles would not be able to move, because kinesin would not attach to microtubules properly.
the vesicles would not be able to move, because kinesin would not attach to them properly.

Explanation:

1. In vesicle - transport, kinesin is a motor protein that moves vesicles along microtubules. The red molecule between the blue blob (vesicle) and the long - tubular structure (microtubule) is likely kinesin.
2. "Zip - code" proteins help in targeting vesicles to specific locations. Without them, kinesin may not attach to the vesicles properly as they are important for the recognition and binding process.
3. The long tubular - shaped structures are microtubules, not actin microfilaments. Actin microfilaments are different cytoskeletal components.

Answer:

First part:

• The red molecule between the big blue blob and the long, tubular - shaped structure is kinesin. (Correct)
• The red "studs" sticking out of the blue blob are "zip code" proteins. (Correct)
• The long tubular - shaped structures are actin microfilaments. (Incorrect)

Second part:

• The vesicles would not be able to move, because kinesin would not attach to them properly. (Correct)
• The vesicles would move, but would not fuse with the membrane at their destination. (Incorrect)
• The vesicles would not be able to move, because kinesin would not attach to microtubules properly. (Incorrect)