AP BIOLOGY

Detailed explanation-1: -Ribosomal RNA is the predominant form of RNA found in most cells; it makes up about 80% of cellular RNA despite never being translated into proteins itself. Ribosomes are composed of approximately 60% rRNA and 40% ribosomal proteins by mass.

Detailed explanation-2: -The structure that is made of rRNA and proteins is the ribosome. Ribosomes are protein factories inside the cell. They can either be free floating in the cytoplasm or attached to the endoplasmic reticulum to produce secreted proteins or proteins for the endomembrane system.

Detailed explanation-3: -A ribosome is made out of RNA and proteins, and each ribosome consists of two separate RNA-protein complexes, known as the small and large subunits. The large subunit sits on top of the small subunit, with an RNA template sandwiched between the two.

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: -rRNA was once known to be the key structural component of ribosomes, but its actually found to be a catalytic element for protein synthesis. It is the most abundant type of RNA (about 80%) in the cell. rRNA is comprised of a large and small subunit. Prokaryotic rRNA is 70 svedbergs large.