Which statement describes the process of finding a mineral's streak? A. When you rub it on a white tile, it leaves a black mark. ООО O B. When you drop a piece of it in acid, a smoky gas is produced. O c. When you strike it against gypsum, it leaves a scratch. O D. When you examine its surface, it looks like dull metal.​

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.