RQ 5-2

What two organelles share a lipid bilayer? a) Endoplasmic reticulum b) Lysosomes c) Nucleus d) Mitochondria

a) Endoplasmic Reticulum c) Nucleus

Imagine protein X is a protein that is secreted out of the cell. How does the cell "know" that protein X needs to be synthesized at the ER? a) The mRNA that codes for protein X has a sequence of nucleotides that bind to a special protein/RNA complex b) Protein X has a sequence of amino acids that bind to a special protein/RNA complex c) The DNA that codes for protein X has a sequence of nucleotides that bind to a special protein/RNA complex d) The ribosomes that translates protein X has a sequence of nucleotides that bind to a special protein/RNA complex

b) Protein X has a sequence of amino acids that bind to a special protein/RNA complex

How does a protein get across the endoplasmic reticulum's lipid bilayer into the "lumen" (inside) of the compartment? a) Through a protein receptor called the "SRP receptor" b) Through a protein channel called a "translocon" c) The protein can pass through the lipid bilayer itself

b) Through a protein channel called "translocon"

How do molecules enter and leave the nucleus? a) Through the endoplasmic reticulum b) Through nuclear pores c) Through the golgi

b) Through nuclear pores

The "Endomembrane System" is involved in synthesizing certain types of proteins, modifying these proteins, and delivering them to the correct destination. Which of the following organelles have a role in one or more of these functions? a) Cell wall b) Transport vesicles c) Golgi apparatus d) Rough ER

b) Transport vesicles c) Golgi apparatus d) Rough ER