The enzyme tryptophan synthase is composed of two polypeptide subunits each encoded by one gene in neurospora crassa. a mutant produces no tryptophan synthase due to a single point mutation in each of the genes (a and b) encoding the two protein subunits. a researcher is interested in identifying a revertant which produces fully functional tryptophan synthase. if the reversion rate for point mutations in n. crassa is 1 x 10-6 per haploid gamete, how many spores, on average, would the researcher need to screen to identify one revertant with the genotype a+ and b+ (functional alleles) which therefore can synthesize tryptophan synthase? a. 106 b. 2x106 c. 1012 d. 10-6 e.

My question says on my assignment. read the following scenarios and decide which of the properties of life are being described. the first one is. katherine stopped on the way to school to grab some donuts. 2. because a dog cannot sweat, it has to pant in order to stay cool. 3. an elephant trun had no bone but 4,000 muscles. i have no idea what i am supposed to anwer. i can't find the answer in my notes or book that i can understand anyway

80 points pls 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?

What are the proteins in connectivity tissues of your foot examples of?