Final answer:
Sec23 and Sec24 are proteins part of the COPII complex that form the vesicular coat required for transporting materials between the endoplasmic reticulum and Golgi apparatus, and do not mediate vesicle docking or induce membrane fusion but rather select and package cargo molecules.
Step-by-step explanation:
The role of Sec23 and Sec24 is to form the COPII coat, which is involved in the transport of materials from the endoplasmic reticulum to the Golgi apparatus. These proteins are part of a larger complex that selects and packages cargo molecules into vesicles. Once vesicles reach their target membranes, such as the cis-Golgi, the COPII coat, which includes Sec23 and Sec24, dissociates. This dissociation is essential for the vesicles to fuse with target membranes and deliver their content.