What is a stem cell?

a. a cell from which a new cell that has a specialized function is formed.
b. a mature egg cell that is capable of forming a new organism.
c. a cell that has half the number of chromosomes of a parent cell.
d. a specialized cell in the skin that identifies pathogenic organisms.

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.

Which of th following is needed for cellular respiration to occur

How far away is the nearest black hole from earth?