Question

1. In order to direct the proteins to the ER they must have added the
   1. nuclear localization signal (NLS)
   2. signal recognition particle (SRP)
   3. dolichol phosphate unit (DPU)
   4. ubiquitin recognition signal (URS)

2. The purpose of dolichol phosphate is to
   1. assemble properly the protein in the ribosome
   2. introduce sugar units in the middle of a protein
   3. activate the protein for sugar addition
   4. carry the sugars to be introduced after protein synthesis

3. Given the importance of glucagon in homeostasis, it must have
   1. a lot of housekeeping genes  
   2. only the required genes for controlled expression
   3. no genes so it can be produced on demand
   4. little gene expression so it can be made in abundance

4.    ATP is required in the catabolism of proteins to
   1. activate ubiquitin
   2. activate the proteins
   3. activate ubiquitin and the proteins
   4. prepare the complex ubiquitin-protein for destruction