why do different people have different dna profiles?

1) they have completely different kinds of str locations
2) they have different numbers of the sam strs
3)all 300 billion base pairs are analyzed for individuals
4)pcr generates some sequences more than other sequences

What processes take place before the mature mrna exits the nucleus?

How can an organ, such as the lungs, work for multiple body systems?

16. which of the following accurately describes a step within transcription? a. dna polymerase uses one strand of rna as a template to put together nucleotides. b. the dna strand is used as a template for which a complementary rna strand can be produced. c. the rna strand forms a template by which dna can be built. d. the rna strand is produced within the cytoplasm.