https://www.dnalc.org/view/16471-Animation-21-RNA-is-an-intermediary-between-DNA
ID: 212319 • Letter: H
Question
https://www.dnalc.org/view/16471-Animation-21-RNA-is-an-intermediary-between-DNA-and-protein-.html (Links to an external site.)
Answer these basic questions based on what you remember about Transcription
Q1. Are all the RNA’s in the cell messenger RNA molecules? If not then what is the difference between the various RNA molecules.
Q2. In the video you learn't about the separation of location with respect to where DNA is and where proteins are made. That led to the hypothesis and later identification of messenger molecule: mRNA. What happens in prokaryotic cells with respect to transcription and subsequent translation of the mRNA?
Q3. When DNA is being made into RNA are both strands of the 'gene' being used/transcribed? If not then what do you think determines which strand will be made into RNA?
Explanation / Answer
1).
Not all the RNAs are messenger RNAs. The three different RNAs present in the cell are,
The ribosomal RNA forms the complex structures known as “ribosomes” by combining with a series of proteins. It is the most abundant type in the cell (75% to 80%). During protein synthesis, it also provide the site of attachment for the mRNA to attach itself to the ribosome.
Messenger RNA (mRNA) carries the genetic data coded from the DNA to the ribosomes in the cytoplasm. The size of mRNA is proportional to the protein length.
Transfer RNA functions to deliver the amino acids to the ribosomes. These amino acids are polymerized to form the polypeptide chains. The tRNAs are the smallest of all other RNAs. The number of nucleotides present are only 75 to 90 nucleotide units. It constitutes about 10% to 15% of RNA in a cell.
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