What is the arrow labeled x pointing to

The trp operon in e.coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone