Question

Place the following structures, molecules, and processes involved in protein synthesis in sequence, beginning with the organelle responsible for the start of protein synthesis?

1) Ribosome
2) mRNA
3) tRNA
4) Nucleus

Answer 1

Protein synthesis starts in the nucleus with transcription of DNA to mRNA, which then travels to the ribosome, where tRNA brings amino acids to construct proteins.

Step-by-step explanation:

The sequence of structures, molecules, and processes involved in protein synthesis begins in the nucleus, where DNA is transcribed into messenger RNA (mRNA). The mRNA then transports this information to the ribosome, which is the site of protein synthesis and can be found either free in the cytoplasm or attached to the endoplasmic reticulum. At the ribosome, transfer RNA (tRNA) brings the appropriate amino acids to correspond with the sequence of nitrogenous bases in mRNA. This interaction is guided by the ribosomal RNA (rRNA) that is a component of the ribosome itself. Thus, the correct order beginning with the site where protein synthesis is initiated is: 4) Nucleus, 2) mRNA, 1) Ribosome, 3) tRNA.