What happens during prophase of meiosis i? a. the spindle fibers are made by centrosomes and are attached to the centromeres of the chromosomes.
b. the duplicated homologous chromosomes pair up and exchange their chromatid segments.
c. spindle fibers reform and attach to the haploid chromosomes.
d. cytokinesis begins, the cells pinch off, forming two cells.

What is the relationship between absorbance of light and the rate of photosynthesis?

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

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.