Which of the following RNAs are base paired?Group of answer choicesmRNAtRNArRNAnascent mRNAnone of the above

To determine which of the following RNAs are base paired, we need to understand the concept of base pairing in RNA molecules. Base pairing refers to the specific pairing of nucleotides between two RNA strands. In RNA, the bases adenine (A) pairs with uracil (U), and cytosine (C) pairs with guanine (G).

Let's analyze each option:

1. mRNA: mRNA stands for messenger RNA, which carries the genetic information from DNA to the ribosomes for protein synthesis. mRNA can form base pairs with complementary sequences of other RNA molecules or DNA during translation, but it is not always base paired.

2. tRNA: tRNA, or transfer RNA, is responsible for carrying amino acids to the ribosomes during protein synthesis. tRNA molecules have specific regions called anticodons that can base pair with complementary codons on mRNA, ensuring the correct amino acid is added to the growing protein chain.

3. rRNA: rRNA, or ribosomal RNA, is a component of ribosomes, the cellular machinery responsible for protein synthesis. rRNA molecules can form base pairs with other rRNA molecules and with mRNA during translation.

4. nascent mRNA: Nascent mRNA refers to the newly synthesized mRNA molecule that is still being transcribed from DNA. It can form base pairs with complementary sequences of other RNA molecules or DNA during transcription, but it is not always base paired.

Based on the information provided, it is clear that both tRNA and rRNA can form base pairs with other RNA molecules. Therefore, the correct answer is tRNA and rRNA.