Question

which structure is required for proteins to enter the endomembrane system?
o kinesin
o signal sequence
o transport vesicle
o microtubules

Explanation:

Proteins targeted for the endomembrane system have a signal - sequence. This sequence acts as a tag that guides the ribosome - nascent protein complex to the endoplasmic reticulum (ER), which is part of the endomembrane system. Kinesin is a motor protein for transport along microtubules, transport vesicles are for moving proteins within the endomembrane system after entry, and microtubules are part of the cytoskeleton and not the entry - requirement for proteins into the endomembrane system.

Answer:

signal sequence