chromatids that are attached at the centromere are called what kind of chromatids?

Galaxy whose shape seems different follow no set pattern are classified as

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.

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird