Draw an energy pyramid for a five-step food chain. if 100 percent of the energy is available at the first trophic level, what percentage of the total energy is available at the highest trophic level

If a checkpoint detects damaged dna, the checkpoint may

Select the correct answer from each drop-down menu. the lac operon in e. coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

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