1- Kinases
form Tyr phosphomonoesters
use ATP as a donor
may use Mg2+ as a cofactor
all of the above

2- About __ of expressed proteins are phosphoproteins
1/8
1/4
1/3
1/2

3- Will inactivate a Ser/Thr/Tyr kinase
mutation at Lys72
Ser changed to Asp
Thr changed to Asp
all of the above

4- Ser/Thr phosphatase metalloenzyme
PPP
PPM
tyrosine phosphatases
the first two are correct

5- A PPP phosphatase
PP4
PP2A
PP5
all of the above

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Answers:

1- Kinases
Answer: all of the above (form Tyr phosphomonoesters AND use ATP as a donor AND may use Mg2+ as a cofactor)

2- About __ of expressed proteins are phosphoproteins
Answer: 1/3

3- Will inactivate a Ser/Thr/Tyr kinase
Answer: mutation at Lys72

4- Ser/Thr phosphatase metalloenzyme
Answer: the first two are correct (PPP AND PPM)

5- A PPP phosphatase
Answer: all of the above