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Concept introduction: A protein is made up of one or more amino acids linked together to form a chain. The building blocks of the protein are called amino acids. Amino acids are termed as residues if they release a hydrogen ion from the
Answer to Problem 1SQ
Correct answer: For a protein-coding gene, an mRNA molecule carries information from the gene to the ribosomes. Hence, option b. is the correct answer.
Explanation of Solution
Reasons for correct statement:
Option b. is given as “mRNA”.
Protein synthesis involved two main processes, namely transcription and translation. Transcription is the process of conversion of deoxyribonucleic acid (DNA) to messenger ribonucleic acid (mRNA). This is catalyzed by the process called transcriptase. These mRNA are protein-coding genes. They carry the information from the gene to the ribosome, where translation takes place. These mRNA are coded for protein and peptide sequences and synthesized. This forms the central dogma of molecular biology. Thus, mRNA carries genetic information from genes to ribosomes. Hence, option b. is the correct answer.
Reasons for the incorrect statement:
Option a. is given as “DNA”. DNA carries genetic information from one gene to another. A protein carries information from a gene to a ribosome; not DNA. Hence, option a. is incorrect.
Option c. is given as, “tRNA”. tRNA is transfer RNA. This carries the amino acids to the ribosome. Proteins carry information from gene to ribosome not tRNA. Hence, option c. is incorrect.
Option d. is given as, “rRNA”. rRNA is the ribosomal RNA that catalyzes the formation of a peptide bond. Proteins carry information from genes to ribosomes; not rRNA. Hence, option d. is incorrect.
Therefore, options a., c., and d. are incorrect.
Conclusion: mRNA carries genetic information from genes to ribosomes.
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Chapter 12 Solutions
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