Draw and label the four distinct phases of a bacterial growth curve. Describe what is happening within the culture as it passes through the phases.

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Welcome back everybody. Our next question says, what happens during the lag phase in a bacterial culture? A bacteria grow and divide at a constant and maximum rate. B the number of deaths exceeds the number of new cells formed. C bacteria are adjusting the environment preparing for growth but not yet multiplying or d the population declines due to the exhaustion of the nutrient supply. Well, even if we don't recall exactly which step is which this one we can kind of use logic to help us with. So it's called a lag phase. You think of a pause. And so the answer choice we want is choice. C bacteria are adjusting the environment preparing for growth but not yet multiplying. So you have a lag not really any big amount of bacterial growth. Yet, when we look at our other ends for choices, choice, a vector growing and dividing at a constant and maximum rate, this would be called the log or exponential fees. So the bacteria have plenty of nutrients. So they're replicating growing at the highest rate they can, since they've got lots of nutrients available, and this rate of growth will be an exponential or logarithmic rate of growth. Thus, this name, but not what we're looking for. And then b when the number of deaths exceeds the number of new cells formed, this would be the decline or death phase. So not our answer. And in choice D the population is declining due to the exhaustion of the nutrient supply, also the decline or death phase. So obviously, it starts with, you know, they're running out of nutrients. So the rate of cell death begins to exceed the rate of new cells appearing. And then finally, you know, just completely died out the phase we're missing here. That's not even mentioned is the stationary phase. This is in between the exponential phase and the decline phase when you have this plateau where the number of cell deaths equals the number of new cells generated. But that's not, doesn't apply to any of these choices. So once again, the lag phase in vetro culture is choice. C bacteria are adjusting to the environment, preparing for growth but not yet multiplying. See you in the next video.

Draw and label the four distinct phases of a bacterial growth curve. Describe what is happening within the culture as it passes through the phases.

Verified video answer for a similar problem:

Key Concepts

Phases of Bacterial Growth Curve

Lag Phase

Log, Stationary, and Death Phases