Which statement describes the relationship between seafloor spreading and continental drift? a. as the seafloor spreads the continents do not move. b. as the continents move they pull the seafloor with them. c. as the continents moved they create new seafloor at the coast. d. as the seafloor spreads the continents move in the same direction.

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.

Plz genetic engineering can be applied to many fields including medicine and agriculture. which of the following is a medical application of genetic engineering? a. giving crop plants recombinant dna so that they would be resistant to herbicides. b. examining a persons pedigree to determine whether they can carry a gene for a genetic disease. c. analyzing a persons dna to see how closely they are related to another person. d. certain genes into bacteria so that they will produce a needed medicine.

How does human environment effect the biosphere