When dna replication halts in a polymerase chain reaction, owing to the incorporation of a tagged base into a growing dna chain, a(n) results?

Dna, in the nucleus carries the genetic code for making proteins in ribosomes. in the diagram, b, represents the proteins produced. dna cannot leave the nucleus to carry the genetic information to the ribosome where proteins are produced. how does the genetic code get from the nucleus to the ribosome? what does a represent? now

Which type of neuron stimulates muscles to contract?

Adding more tributaries to a local river basin can have what effect?