How does the genotype of a bacterium determine its phenotype? Use the terms gene, mRNA, ribosome, and polypeptide in your answer.

검증된 단계별 안내

Understand that the genotype of a bacterium refers to its genetic makeup, specifically the sequence of genes within its DNA.

Recognize that a gene is a segment of DNA that contains the instructions to make a specific product, usually a polypeptide (protein).

Explain that the gene is transcribed into messenger RNA (mRNA), which serves as a temporary copy of the genetic information.

Describe how the mRNA is then translated by the ribosome, a molecular machine that reads the mRNA sequence and assembles the corresponding polypeptide chain by linking amino acids in the correct order.

Conclude that the polypeptide produced folds into a functional protein that contributes to the bacterium's observable traits, or phenotype, thus linking the genotype to the phenotype.

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주요 개념

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Gene and Genotype

A gene is a segment of DNA that contains the instructions for making a specific protein. The genotype refers to the complete set of genes in an organism, which determines its hereditary traits. In bacteria, the genotype provides the blueprint for all cellular functions and characteristics.

Transcription and mRNA

Transcription is the process where the DNA sequence of a gene is copied into messenger RNA (mRNA). The mRNA serves as a temporary, mobile copy of the genetic information, carrying the code from the DNA in the nucleus (or nucleoid in bacteria) to the ribosome for protein synthesis.

Translation, Ribosome, and Polypeptide

Translation occurs when the ribosome reads the mRNA sequence to assemble amino acids into a polypeptide chain, forming a protein. The sequence of amino acids in the polypeptide determines the protein's structure and function, which ultimately influences the bacterium's phenotype or observable traits.