The phenotype of an organism is primarily determined by the activity of _______.

Question

Quizplus · Accepted Answer

Proteins are responsible for the expression of traits in an organism, and therefore the phenotype. While nucleic acids (DNA and RNA) provide the genetic information, it is the proteins that actually carry out the functions and determine the physical characteristics of the organism. tRNA, mRNA, and rRNA are all types of RNA that play specific roles in protein synthesis, but they do not directly determine the phenotype.

The Phenotype of an Organism Is Primarily Determined by the Activity