Quiz 9 Key |
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An answer may be used more than once for each section.
1-2. Classify each carrier as a/n (A) antiport; (S) symport; or (U) uniport.
U GLUT1 (glucose transporter) |
U Ca2+ ATPase |
A Na+–K+ ATPase |
S Na+–glucose carrier |
A HCO3−–Cl− carrier |
3-4. Classify the same carriers as performing (R) primary active transport;
(E) secondary active transport; (D) diffusion, not active transport.
D GLUT1 (glucose transporter) |
R Ca2+ ATPase |
R Na+–K+ ATPase |
E Na+–glucose carrier |
D HCO3−–Cl− carrier |
5-6. Answer with (C) acetylcholine receptor; (E) epinephrine receptor; (I) insulin receptor; or (L) all three receptors.
C a gated ion channel |
L an integral membrane protein |
I an enzyme (a kinase) |
C has helices that rotate |
E activates an enzyme indirectly |
E desensitized by β-arrestin |
7-10. Answer with (A) adenylyl cyclase; (G) Gα; (P) protein kinase A; or (R) 7tm receptor.
A converts ATP to cAMP |
G activated by binding the receptor |
G converts GTP to GDP |
R activated by binding epinephrine |
P converts ATP to ADP |
P activated by binding cAMP |
R not an enzyme |
A activated by binding Gsα |
R, A an integral membrane protein |
G Its inactive form is heterotrimeric. |
G a lipid-anchored membrane protein |
P Its inactive form has 4 subunits. |
P a protein in the cytosol |
P inactivated when cAMP → AMP |
A synthesizes a second messenger |
G inactivated when GTP → GDP |