What type of vesicles are involved in bringing proteins from the ER to the Golgi?

Transport vesicles play a crucial role in the movement of proteins from the endoplasmic reticulum (ER) to the Golgi apparatus. These vesicles bud off from the membrane of the ER, encapsulating newly synthesized proteins that are destined for further processing, sorting, or secretion. Once formed, the transport vesicles carry these proteins to the Golgi apparatus, where they undergo a series of modifications, such as glycosylation, and are packaged for delivery to their final destinations.

This transport mechanism is essential for ensuring that proteins reach the correct cellular compartments, and it highlights the importance of vesicular trafficking in maintaining cellular organization and functionality. In contrast, secretory vesicles are primarily involved in transporting proteins from the Golgi to the cell surface for secretion, lysosomal vesicles are responsible for delivering substrates to lysosomes, and endocytic vesicles facilitate the uptake of extracellular materials into the cell. Hence, transport vesicles are specifically tailored for conveying proteins from the ER to the Golgi, making them the correct choice for this question.