The total number of correct statements, regarding the nucleic acids is_________. A. RNA is regarded as the reserve of genetic information. B. DNA molecule self-duplicates during cell division. C. DNA synthesizes proteins in the cell. D. The message for the synthesis of particular proteins is present in DNA. E. Identical DNA strands are transferred to daughter cells.
Let’s evaluate each statement regarding nucleic acids:
Statement A: RNA is regarded as the reserve of genetic information. Evaluation: False. DNA is the primary genetic material that serves as the reservoir of genetic information, while RNA plays a role in protein synthesis.
Statement B: DNA molecule self-duplicates during cell division. Evaluation: True. DNA replication occurs during the S phase of the cell cycle, allowing genetic information to be passed to daughter cells.
Statement C: DNA synthesizes proteins in the cell. Evaluation: False. DNA itself does not synthesize proteins; rather, it serves as a template for mRNA synthesis, which then translates to proteins.
Statement D: The message for the synthesis of particular proteins is present in DNA. Evaluation: True. DNA contains the sequences (genes) that code for proteins.
Statement E: Identical DNA strands are transferred to daughter cells. Evaluation: True. During DNA replication, each daughter cell receives an identical copy of DNA.
Summary of Correct Statements: Correct statements: B, D, and E.
Thus, the total number of correct statements regarding nucleic acids is: 3
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Approach Solution -2
Evaluate the given statements (A, B, C, D, E) regarding nucleic acids to determine how many are correct.
Concept Used:
Fundamental principles of molecular biology:
DNA (Deoxyribonucleic acid) stores and transmits genetic information.
RNA (Ribonucleic acid) acts primarily as a messenger and helper in protein synthesis.
Central Dogma: DNA → RNA → Protein.
DNA replication occurs before cell division, producing identical copies for daughter cells.
Step-by-Step Solution:
Step 1: Analyze Statement A: "RNA is regarded as the reserve of genetic information." This is incorrect. DNA is the primary reservoir of genetic information in cells. RNA serves as a messenger and functional molecule, not the main storage.
Step 2: Analyze Statement B: "DNA molecule self-duplicates during cell division." This is correct. The process of DNA replication occurs during the S-phase of the cell cycle, producing two identical DNA molecules.
Step 3: Analyze Statement C: "DNA synthesizes proteins in the cell." This is incorrect. DNA contains the code for protein synthesis, but the actual synthesis (translation) occurs on ribosomes using mRNA, tRNA, and rRNA. DNA itself does not synthesize proteins.
Step 4: Analyze Statement D: "The message for the synthesis of particular proteins is present in DNA." This is correct. The sequence of nucleotides in DNA contains genes that code for specific proteins through the genetic code.
Step 5: Analyze Statement E: "Identical DNA strands are transferred to daughter cells." This is correct. During cell division, replicated DNA molecules (identical copies) are distributed to daughter cells, ensuring genetic continuity.
Thus, the correct statements are B, D, and E.
The total number of correct statements regarding nucleic acids is 3.
