AP BIOLOGY

Detailed explanation-1: -rRNAs combine with proteins and enzymes in the cytoplasm to form ribosomes, which act as the site of protein synthesis. These complex structures travel along the mRNA molecule during translation and facilitate the assembly of amino acids to form a polypeptide chain.

Detailed explanation-2: -rRNA is a non-coding RNA that helps to form ribosomes, which are the protein-synthesizing organelle of the cell. rRNA when encoded are either small or large. These small and large rRNA’s combine with ribosomal proteins and once assembled in the proper location, serve as ribosomal subunits for protein synthesis.

Detailed explanation-3: -Ribosomal RNA (rRNA) is the most common form of RNA found in cells – it makes up around 50% of the structure of the ribosomes. It is produced in the nucleus, before moving out into the cytoplasm to bind with proteins and form a ribosome.

Detailed explanation-4: -The ribosome is a complex molecule made of ribosomal RNA molecules and proteins that form a factory for protein synthesis in cells. In 1955, George E. Palade discovered ribosomes and described them as small particles in the cytoplasm that preferentially associated with the endoplasmic reticulum membrane.

Detailed explanation-5: -Once transcription is complete, the external transcribed spacer at the 3′ end of the molecule is removed. In human cells, this step is followed by a cleavage at the 5′ end of the 5.8S region, yielding separate precursors to the 18S and 5.8S + 28S rRNAs. Additional cleavages then result in formation of the mature rRNAs.