The building blocks that compose proteins are called ___________________. The instructions for building these proteins are found in __________. A group of _______ nitrogen bases is the code that calls for one _________________. A group of three nitrogen bases is called a ___________. The protein building instructions are found in the ____________ (part of the cell), but the proteins are actually built by the ________________. The protein building instructions must be sent out to the cytoplasm. A copy of the instructions is made in the form of ________. This process is called ______________________.