Final answer:
The DNA transcription process involves creating mRNA, rRNA, and tRNA from DNA. Exons, which are part of mRNA, and rRNA are transcribed from DNA, while proteins are synthesized through translation, not transcription. The correct answer to the question is 'D. B and C only' indicating exons and rRNA are transcribed from DNA.
Step-by-step explanation:
The student's question involves the concept of gene expression which includes the processes of transcription and translation.
Transcription and DNA
During transcription, segments of DNA are used as templates to produce complementary RNA molecules. This stage involves the creation of three main types of RNA:
- mRNA (messenger RNA): This is the template for protein synthesis containing the code for proteins.
- rRNA (ribosomal RNA): It forms an integral part of the structure and function of ribosomes, which are the machines that drives the synthesis of proteins.
- tRNA (transfer RNA): This molecule brings the correct amino acids to the ribosome according to the mRNA's code during protein synthesis.
Based on the information provided, exons (which are the coding regions of a gene and part of mRNA) and rRNA are the correct answer to the student's question as both are transcribed directly from DNA.
Proteins, meanwhile, are not transcribed from DNA; they are synthesized through the process of translation, which follows transcription. Therefore, the correct answer is D. B and C only (exons and rRNA are transcribed from DNA).