Each bacterial cell in a population emits a chemical that, when received by another cell, activates the transcription of certain genes. But if the population density is too low, the signal is not received and nothing happens. When the population grows large enough, many cells are sending and receiving the signals and they can coordinate their behaviors and genetic response.

This describes ______.

Question

Each bacterial cell in a population emits a chemical that, when received by another cell, activates the transcription of certain genes. But if the population density is too low, the signal is not received and nothing happens. When the population grows large enough, many cells are sending and receiving the signals and they can coordinate their behaviors and genetic response.

This describes ______.

BlackTom AI · Accepted Answer

Consider the scenario described: individual bacterial cells produce a chemical signal that only elicits a coordinated transcriptional response when the population reaches a sufficient density. This means that cell-to-cell communication depends on the number of neighboring cells and results in synchronized gene expression.

Option 1: 'hormone signaling' – While hormones mediate communication in many organisms, this term typically refers to signaling between cells within a multicellular organism, not the density-dependent coordination seen among bacteria. This choice misses the key density-dependent coordination concept.

Option 2: 'quorum sensing' – This is the classic term for the described phenomenon. Bacteria release signaling molecules (autoinducers); when their concentration crosses a threshold due to high cell density, the signal is detected and a coordinated change in gene expression occurs. The description matches quorum sensing precisely.

Option 3: 'long distance signaling' – This phrase generally refers to signaling mechanisms that traverse considerable physical distances within an organism or environment, such as hormonal signaling throughout a body, but it does not capture the density-dependent coordination that is central to the example.

Option 4: 'signal transduction' – This broad term covers the cascade of molecular events from signal detection to a cellular response. While related, it does not specify the communal, density-dependent aspect of signaling among a population of cells, which is critical here.

In summary, the scenario aligns best with quorum sensing because it hinges on population density enabling communication and coordinated gene expression among bacterial cells.

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