Which of the following statements about a protein in the lumen of the ER is false?
(a) A protein in the lumen of the ER is synthesized by ribosomes on the ER membrane.
(b) Some of the proteins in the lumen of the ER can end up in the extracellular space.
(c) Some of the proteins in the lumen of the ER can end up in the lumen of an organelle in the endomembrane system.
(d) Some of the proteins in the lumen of the ER can end up in the plasma membrane.
(d) Plasma membrane proteins come from proteins in the ER membrane, not from the ER lumen.
You might also like to view...
The main causes of species extinction include:
_____ climate change _____ introduced species _____ ecosystem stability _____ direct exploitation _____ habitat loss _____ range expansion
Which of the following structures is not part of an operon?
A. structural gene B. operator C. regulator gene D. promoter E. All of these are part of an operon.
Which of the following traits characterizes gymnosperms?
a) The plants carry exposed seeds on modified leaves. b) Reproductive structures are located in a flower. c) After fertilization, the ovary thickens and forms a fruit. c) The gametophyte is longest phase of the life cycle.
Classification of organisms into three domains is based on
A) the presence of a cell wall. B) the number of cells in the organism. C) cellular organization. D) nutritional requirements. E) cellular proteins.