D. both a and b
homozygous means that the genotypes would be the same. so, homo dominant (ex. RR) and homo recessive (ex. rr) would be considered purebred genotypes
It is an adaptation. It is called an adaptation because the animal adapts to it's surroundings to avoid predators.
It is an adaptation.
The trp repressor blocks transcription of the trp operon when the repressor binds to tryptophan. The trp repressor or the tryptophan repressor is a transcription factor that is involved in controlling amino acid metabolism. In the trp operon, tryptophan binds to the repressor protein thus effectively blocking gene transcription.
The first one: Many types of water and land biomes exist on earth.
no sure but mitochondria exchange substances witht he cytosol. probably wrong tho
