Final answer:
Ribosomes are the cellular structures described, responsible for protein synthesis and composed of rRNA and protein. They consist of two subunits and can be found in the cytoplasm or bound to the endoplasmic reticulum, and the correct answer is B. Ribosomes.
Step-by-step explanation:
The ribonucleoprotein particles described in the question are known as ribosomes. Ribosomes are essential cellular organelles responsible for protein synthesis. A typical eukaryotic cell can contain around 10,000 to several million ribosomes, depending on the type and function of the cell. Ribosomes are composed of ribosomal RNA (rRNA) and protein, and they translate messenger RNA (mRNA) into polypeptide chains, which then fold into functional proteins. They consist of two subunits, a larger one and a smaller one, and can be found either floating freely in the cytoplasm or bound to the endoplasmic reticulum. The correct answer to the multiple-choice question is B. Ribosomes.
Ribosomes are small organelles found in the cytoplasm that are responsible for protein synthesis. They are composed of ribosomal protein and ribosomal RNA (rRNA). Ribosomes can be found alone or in groups within the cytoplasm, and some are attached to the endoplasmic reticulum.