Refer to the Hypothetical Data Set Comparing the Gene Content

question 228

Multiple Choice

Refer to the hypothetical data set comparing the gene content of Salmonella and Shigella, of which all strains are pathogenic, and the pathogenic and nonpathogenic strains of E.coli.(Note: "x" denotes presence of the gene.) Which is the most likely conclusion about gene C?

• A) It may be involved in pathogenicity and was acquired from Salmonella strain 1.
• B) It may be involved in pathogenicity and was acquired from Salmonella strain 2.
• C) It may be involved in pathogenicity and was acquired from Shigella.
• D) It may be involved in pathogenicity, and its origin is unclear.
• E) It is unlikely to be involved in pathogenicity.

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Definitions:

Cytokinesis

The division of the cell's cytoplasm into two distinct daughter cells immediately following mitosis, ensuring that each cell receives its share of the cytoplasm.

Eukaryotic Fission

A type of cell division in eukaryotic organisms, similar to binary fission, resulting in the replication and division of a cell into two genetically identical daughter cells.

Proto-Oncogenes

Normal genes that, when mutated, become oncogenes and can contribute to cancer development by promoting cell growth and division.

Checkpoint Genes

Genes that regulate the cell cycle and ensure that each phase is completed accurately before the next one begins, acting as safeguards against cellular damage and uncontrolled cell growth.