1- Sos is a
small G-protein
GNEF
MAP kinase
GAP

2- After a G-proten transmits a signal
GTP is hydrolyzed
alpha binds beta/gamma
receptor has high affinity
all of the above

3- Approximate size of alpha subunit
8 to 10 kD
20 to 30 kD
35 to 36 kD
39 to 46 kD

4- Nucleotide exchange in a small G-protein is catalyzed by
activated receptor
alpha subunit
GAP
GNEF

5- Ras may phosphorylate
another kinase
a MAPKKK
Raf
all of the above

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Answers:

1- Sos is a
Answer: GNEF

2- After a G-proten transmits a signal
Answer: all of the above ( GTP is hydrolyzed AND alpha binds beta/gamma AND receptor has high affinity)

3- Approximate size of alpha subunit
Answer: 39 to 46 kD

4- Nucleotide exchange in a small G-protein is catalyzed by
Answer: GNEF

5- Ras may phosphorylate
Answer: all of the above (another kinase AND a MAPKKK AND Raf)