Question

1.) which statement does not describe a step in the response to photon absorption by rhodopsin?...

1.) which statement does not describe a step in the response to photon absorption by rhodopsin?

a. Rhodopsin catalyzes GDP/GTP exchange on transducin

b. light absorption converts all-trans-retinal to 11-cis-retinal

c. all-trans-retinal is replaced with 11-cis-retinal

d. rhodopsin is phosphorylated by rhodopsin kinase

e. arrestin binds to the phosphorylated end of rhodopsin

2.) what is the abbreviated nomenclature for a 14-carbon omega-3 fatty acid that contains no other double bonds?

a. 13:1 (delta11)

b. 14:1 (delta3)

c. 14:0(delta11)

d. 17:1(delta14)

e. 14:1(delta11)

3.) which of the following is not involved in signal transduction by the β-adrenergic receptor pathway

a. GTP-binding protein

b. cyclic AMP synthesis

c. protein kinase

d. GTP hydrolysis e. all of these are involved

4.) GTP binding to which subunit in a heterotrimeric G-protein is associated with a receptor signal?

a. a beta/gamma dimer

b. the Beta subunit

c. the gamma subunit

d. the alpha subunit

e. none of the above

5.) which statment is true regarding lipid anchors?

a. GPI anchors and prenylations are both attached to the C-terminal end of the mature protein

b. myristoylations and palmitoylations are both reversible modifications

c. prenylations occur exclusively on the outsie leaflet of the plasma membrane

d. palmitolations and prenylations both occur via thioester linkages

Homework Answers

Answer #1

1.) which statement does not describe a step in the response to photon absorption by rhodopsin?

a. Rhodopsin catalyzes GDP/GTP exchange on transducin

b. light absorption converts all-trans-retinal to 11-cis-retinal

c. all-trans-retinal is replaced with 11-cis-retinal

d. rhodopsin is phosphorylated by rhodopsin kinase

e. arrestin binds to the phosphorylated end of rhodopsin

2.) what is the abbreviated nomenclature for a 14-carbon omega-3 fatty acid that contains no other double bonds?

a. 13:1 (delta11)

b. 14:1 (delta3)

c. 14:0(delta11)

d. 17:1(delta14)

e. 14:1(delta11)

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