Which of the following statements is true?

1.Cooling magma is slowing adding land to the continents.
2.Convection currents in the mantle keep crustal plates moving.
3.The oceanic plate is made mostly of granite and limestone.
4.The theory of continental drift was immediately accepted by the scientific community.

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.

Does the sun release radiant energy?

Is becoming less expensive to screen blood samples for dna certain diseases have genetic basis what is possible ethical concern about the availability of inexpensive dna testing