Phenylketonuria (pku) is a recessive human disorder in which an individual cannot appropriately metabolize a particular amino acid. this amino acid is not otherwise produced by humans. therefore the most efficient and effective treatment is which of the following? a) feed them the substrate that can be metabolized into this amino acid. b) transfuse the patients with blood from unaffected donors. c) regulate the diet of the affected persons to severely limit the uptake of the amino acid. d) feed the patients the missing enzymes in a regular cycle, i. e., twice per week.

Me brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula.5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects.8. describe the planets’ orbits around the sun.9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets.13. what causes the seasons?