U937d cells express high levels of creatine kinase (ck‑b) mrna but do not translate the mrna into protein. ribosomes bind the 5' end of the ck‑b mrna; however, translation into protein is repressed in these cells. u937d cells synthesize the ck‑b enzyme when researchers introduce numerous short segments of rna containing 3' utr consensus sequences into the cells. the total amount of ck‑b mrna does not change after adding rna containing 3' utr sequences. introducing short rna segments without the 3' utr consensus sequences does not stimulate ck‑b synthesis. which of the statements explains how the introduction of short rna containing 3' utr sequences allows ck‑b translation in u937d cells? .explain how the introduction of short segments of rna containing the 3'utr sequences might remove the inhibition.

What drives the atp synthase reactions that produce atp

Which of the following describes how binary fission and mitosis are similar? a)they are both used for growth or repair b)they both break down membrane-bound nuclei c)both invoke the replication of a single stand of dna d)both replicate genetic material

You will create a molecular clock model for an arthropod gene. follow these guidelines to make your model: . your timeline will span from 90 million years ago to the present. the common ancestor in your model is an arthropod that lived 90 million years ago. the gene that you'll track codes for a protein in the species venom . the dna sequence youll track contains 10 nitrogen bases. you can choose the order of the bases and where the mutations occur. this gene mutates at a rate of approximately 0.76 base pairs every 17.1 million years. to build your model,/ calculate the estimated time period it takes for 1 base pair to mutate. the first time period will only show the common ancestor. at the beginning of the second time period, three lineages will diverge from the common ancestor, each with a different mutation in their gene sequences. the first and third descendant species will survive for the rest of the timeline. the second descendant species was extinct 50 million years ago. calculate how long it will take for one full base pair mutation to occur. explain your reasoning by constructing a mathematical equation