Final answer:
The main components of the ribosomes are ribosomal RNA (rRNA), and the correct answer to the question is (E) rRNA.
Step-by-step explanation:
The central dogma of molecular biology is that DNA is transcribed into RNA, which is then translated into a protein. This process is facilitated by different types of RNA. The question asks, which of the following RNAs are the main components of the ribosomes? The correct answer is (E) rRNA, which stands for ribosomal RNA. rRNA, along with proteins, makes up the structure of the ribosome, where translation occurs. During translation, rRNA forms the catalytic part of the ribosome that joins amino acids together. mRNA (messenger RNA) carries the genetic code from DNA to the ribosome to be translated into a protein, and tRNA (transfer RNA) brings the appropriate amino acids to the ribosome as specified by the mRNA.