Membrane compartments of the cell

1. Match each molecule with the mechanism(s) it uses to enter and exit membranes. (Options: nuclear pores, diffusion/protein-mediated transport, vesicular transport) a. amino acids b. RNA c. proteins d. sugars e. neurotransmitters

A: amino acids = diffusion/protein-mediated transport; RNA = nuclear pores; proteins = nuclear pores AND vesicular transport; sugars = diffusion/protein-mediated transport; neurotransmitters = vesicular transport

2. Chromatin and other nuclear components bind to which part of the nucleus?

A: Nuclear lamina (protein lining of the inner membrane)

3. List the 5 steps involved in ribosome assembly.

A: (1) Ribosomal proteins are synthesized in the cytoplasm; (2) Proteins are transported into nucleus via nuclear pores; (3) rRNA synthesis in the nucleolus: ribosomal proteins associate with appropriate rRNA to form ribosomal subunits; (4) Subunits are transported back out of the cytoplasm through nuclear pore complexes; (5) Ribosomes self assemble from subunits in cytoplasm