Question

The following four events occur during cell locomotion: Place them in the correct order. 1) The cell breaks its rear contacts with the substratum, retracting its trailing edge. 2) A part of the cell surface protrudes in the direction of cell movement. 3) Lower surface of cell protrusion attaches to substratum, forming temporary anchorage sites. 4) The bulk of the cell is pulled forward over adhesive contacts. What is the correct order of these events?

1) 1, 2, 3, 4
2) 2, 3, 1, 4
3) 3, 2, 1, 4
4) 4, 3, 2, 1

Answer 1

The correct order of events in cell locomotion is: 2) Protrusion, 3) Attachment, 1) Retraction, 4) Pulling.

Step-by-step explanation:

The correct order of the four events that occur during cell locomotion is:

1. 2) A part of the cell surface protrudes in the direction of cell movement.
2. 3) Lower surface of cell protrusion attaches to substratum, forming temporary anchorage sites.
3. 1) The cell breaks its rear contacts with the substratum, retracting its trailing edge.
4. 4) The bulk of the cell is pulled forward over adhesive contacts.

This order ensures that the cell can move efficiently, with the protrusion and attachment of the cell surface leading the way, followed by the retractions and pulling of the cell body.