Final answer:
SREBP is released when cellular cholesterol levels are low and it helps regulate cholesterol and fatty acid metabolism. SCAP is the protein that assists in transporting SREBP to the Golgi apparatus for activation.
Step-by-step explanation:
SREBP, or sterol regulatory element-binding protein, is released when cellular cholesterol levels are low. It plays a critical role in regulating cholesterol and fatty acid metabolism. SCAP, or SREBP cleavage-activating protein, is an escort protein that aids in the transport of SREBP from the endoplasmic reticulum to the Golgi apparatus, where it can be activated.