1.  Regulation of protein activity by phosphorylationrequires ________ activity.

1. kinase
2. ubiquitin
3. protease
4. phosphatase
5. 20S proteasome

2. Which of the following are substrates used by RNA polymerasein the process of transcription?

1. DNA template
2. ribonucleotie triphosphates
3. deoxyribonucleotide triphosphates
4. inorganic phosphates
5. proteins

3.  The ribosome

1. is an enzyme complex made entirely of protein molecules.
2. directs elongation of polypeptides.
3. is organized into 2 subunits whose sizes are designated inSvedberg (S) units.
4. is not used by cells that secrete large amounts ofprotein.
5. is both b and c.

4. Characteristics of a buffer are:

1. They help maintain the cell’s pH.
2. Their buffering capacity is independent of all otherfactors.  
3. They must be a strong acid or strong base.
4. Both a and b.
5. Both a and c.

5. Logical use(s) of a cystolic protein would be:

1. To associate with extracellular molecules.
2. Transport through biomembrane.
3. Anchoring and signaling.
4. To activate or inactivate a cell surfacereceptor.
5. To prevent unwanted molecules from passing across thebiomembrane and into the cell.

6. Which of the following factors increase the rate of simple(passive) diffusion of a solute __________ across a phospholipidbilayer?

1. increased ability of the solute to dissolve in themembrane
2. increased hydrophilicity of the solute
3. increased membrane thickness
4. all of the above
5. none of the above

7. The major classes of CAMs include:

1. cadherins
2. fibronectin
3. Ig-superfamily CAMs
4. P-selectins
5. steroids

8. Movement of phospholipids from oneleaflet to the other

      a.occurs routinely.

      b.requires cholesterol.

      c.requires flippases.

      d. isimpossible.

9. Which of the following plays a rolein the degradation of proteins?

      a.chaperonin

      b.ubiquitin

      c.proteasome

      d. band c

      e. allof the above

10. Reversible chemical interactions are mediated by

1. electrostatic interactions.
2. hydrogen bonds.
3. van der Waals interactions.
4. all of the above.
5. none of the above.