Which of these is a way to bring animals back from the brink of extinction? a) captive breeding
b) in-vitro fertilization
c)cloning
d) all of the above

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 part of the brain is highlighted in the diagram below?

An animal cell (left) and a plant cell (right) are shown. which organelle, labeled x in the diagram, is found in both plant and animal cells?