Multiple Choice
Which of the following is not a property of RNA?
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4. DNA, Chromosomes, and Genomes
DNA vs. RNA
Multiple Choice
Within the context of DNA vs. RNA, what is the primary role of RNA in the cell?
A
To act as an intermediary that carries genetic information and helps direct protein synthesis (e.g., mRNA, tRNA, rRNA).
B
To catalyze the synthesis of DNA from amino acids during translation at the ribosome.
C
To serve as the long-term, stable storage molecule for hereditary information in the nucleus of eukaryotic cells.
D
To form the lipid bilayer of cellular membranes and regulate transport across the plasma membrane.
Verified step by step guidance1
Step 1: Understand the roles of nucleic acids in the cell. DNA primarily stores genetic information long-term, while RNA plays various roles related to gene expression and protein synthesis.
Step 2: Identify the main types of RNA involved in the process: messenger RNA (mRNA) carries the genetic code from DNA to the ribosome; transfer RNA (tRNA) brings amino acids to the ribosome; ribosomal RNA (rRNA) is a structural and catalytic component of ribosomes.
Step 3: Recognize that RNA acts as an intermediary molecule that translates the genetic information stored in DNA into proteins, which are essential for cellular function.
Step 4: Eliminate incorrect options by matching their descriptions to known cellular functions: RNA does not catalyze DNA synthesis from amino acids, DNA—not RNA—is the stable hereditary molecule, and lipids—not RNA—form cellular membranes.
Step 5: Conclude that the primary role of RNA in the cell is to carry genetic information and help direct protein synthesis, serving as the link between DNA and protein production.
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