If a repressor protein attaches to the operator, RNA polymerase cannot proceed to transcribe key enzymes needed by the organism. This can be seen in the trp operon in E .coli bacteria.
They both containing carbon, but only nucleic acids containing phosphorus is what correctly compares nucleic acids and carbohydrates.
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What is Carbohydrate?</h3>
This contains carbon, hydrogen and oxygen and serves as a source of energy to organisms.
Nucleic acids are similar to proteins and contain phosphorus while carbohydrate doesn't.
Read more about Carbohydrate here brainly.com/question/1178789
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Natural Selection is not random because the organisms of a species that do not survive have a non-desirable genetic quality, a disease, injury, etc. This leaves the better organisms of a species to survive and reproduce, which creates a stronger and larger species.