What is the key advantage of grouping genes of related function into one transcription unit?

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

Which codon is the code for the amino acid histidine (his)?

What element is able to combine with itself and hydrogen to form large molecules ?