Protein kinases are enzymes that transfer the terminal phosphate from ATP to an amino acid residue on the target protein. Many are located on the plasma membrane as integral membrane proteins or peripheral membrane proteins
What purpose may be served by their plasma membrane localization? A) ATP is more abundant near the plasma membrane.
B) They can more readily encounter and phosphorylate other membrane proteins.
C) Membrane localization lowers the activation energy of the phosphorylation reaction.
D) They flip back and forth across the membrane to access target proteins on either side.
B
You might also like to view...
Why are eukaryotic organisms so much more diverse than prokaryotic organisms?
A. Their genomes are larger than those of prokaryotes. B. They reproduce sexually. C. They compartmentalize energy metabolism. D. All of these choices are correct.
Which of the following is an example of a peptide hormone?
A. insulin B. adrenaline C. cortisol D. testosterone E. progesterone
During interaction between genes and environment, the phenotype ____
a. changes the genotype b. is expressed as discontinuous variation c. is variable and undergoes continuous change throughout the life of the organism d. can be quantitatively subdivided into genotypic and environmental components e. cannot vary
A trait not common to all animals is
A. Eukaryotic B. Spinal cord C. Heterotroph D. Multicellular