The correct layer is "<span>there is an additional third oblique layer of smooth muscle".
The muscularis externa of the stomach is purely smooth muscle (no skeletal muscles or other striated muscles) composed of three layers; inner oblique, middle circular, and external longitudinal layers. Plicae circularis can only be found in the intestines, not in the stomach.</span>
The photosynthesis I guess
The correct answer is: They are released into the cytosol.
A a sequence consisting of 5-30 hydrophobic amino acids on the N-terminus, which is called signal peptide or signal sequence is responsible for directing the transport of the synthesized protein. Proteins that contain such sequence are destined for secretion form the cell (vesicular), for the plasma membrane, the lumen or membrane of either the (ER), Golgi or endosomes. So, when the protein lack the sequence, it is released in the cytosol.