Quiz 8 KeyFall 2009 |
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1-4. Use these choices: (A) antiport (C) channel; (S) symport; (U) uniport
If a phrase is true for two, answer with either. Use each choice at least once.
U GLUT-1 is an example. |
C Has a high flux of solute movement |
S Has a Kt of transport |
A The sodium-potassium pump is an example |
5-6. Primary active transport and/or secondary active transport uses diffusion.
If only one, say which, and name one similarity.
If both, explain the difference between primary and secondary active transport.
Only secondary active transport uses diffusion. Both primary and secondary active transport require a carrier protein that changes conformation (with all the characteristics involved), and both must transport the same solute.
Differences between primary and secondary active transport (NOT required for your answer, but I'm including them):
Primary active transport uses ATP, and secondary active transport does not.
Primary active transport creates an electrochemical gradient for a solute, and secondary active transport uses the gradient.
Secondary active transport must involve moving two solutes by the same carrier, but primary active transport may move only one.
7-10. Use these choices: (A) ATP; (C) cAMP; (D) ADP; (E) epinephrine; (F) GDP; (G) GTP.
C Binds the R subunit of PKA |
A Binds the active site of PKA |
D A product of PKA |
E Binds a beta-adrenergic receptor |
Remember that when PKA transfers a phosphoryl group to a protein, ADP is one of the products.
Bonus (1 point): Draw the structure of threonine.
I'm not including the structure of threonine here. I added this into the quiz partly because I thought question 5-6 might be challenging but more because I wanted to remind you that you need to remember all of the amino acid structures (and names and abbreviations).