Question

which of the following information could not be gained from a genomic study of a pathogenic strain and a nonpathogenic strain of the same species of bacteria? choose one: a. presence of pathogenicity islands in the pathogenic strain b. identity of possible virulence genes present in the pathogenic strain but not present in the nonpathogenic strain c. genes that are expressed when the pathogenic bacteria infect a host d. lack of metabolic genes in both strains that would make them hard to grow in culture

Answer 1

A genomic study cannot reveal which genes are expressed when the pathogenic bacteria infect a host; it can only provide information on the presence or absence of genes, such as those for virulence and antibiotic resistance.

Step-by-step explanation:

The information that could not be gained from a genomic study of a pathogenic strain and a nonpathogenic strain of the same species of bacteria is genes that are expressed when the pathogenic bacteria infect a host. Genomic studies can reveal the presence of pathogenicity islands and the identity of possible virulence genes in the pathogenic strain, differences in the presence or absence of certain genes, such as those for antibiotic resistance, and metabolic genes affecting growth in culture. However, genomic studies alone cannot determine which genes are expressed during infection, as this requires observing the bacteria within the context of a host's environment. This typically involves further experiments beyond genomic sequencing, such as transcriptomic analysis during infection.