Textbook Question
The RNA species that travels from the nucleus to the cytoplasm carrying the coded message specifying the sequence of amino acids in the protein to be made is
a. mRNA
b. tRNA
c. rRNA
d. all of these
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29. Heredity
Factors Affecting Gene Expression
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According to the central dogma, what is the intermediate molecule involved in the flow of information in a cell that should go in the blank? DNA → ________ → Proteins
A
Ribosome.
B
rRNA.
C
mRNA.
D
tRNA.
Verified step by step guidance1
Understand the central dogma of molecular biology, which describes the flow of genetic information in a cell: DNA → RNA → Proteins. This process involves transcription and translation.
Identify the intermediate molecule that carries the genetic information from DNA to the ribosome for protein synthesis. This molecule is RNA, specifically messenger RNA (mRNA).
Recall that during transcription, the DNA sequence is used as a template to synthesize mRNA. This mRNA contains codons that correspond to specific amino acids.
Recognize that mRNA serves as the intermediary between DNA and proteins, as it is translated by ribosomes into a polypeptide chain during the process of translation.
Eliminate other options: Ribosome is the site of protein synthesis, rRNA is a structural component of ribosomes, and tRNA brings amino acids to the ribosome during translation. The correct intermediate molecule is mRNA.
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