Microbial Biomass Methods Review Test

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| By Jimenaes
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Jimenaes
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Quizzes Created: 2 | Total Attempts: 211
| Attempts: 84
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  • 1/6 Questions

    This method relies on the luciferin-lucirefase reaction for the measurement of biomass in soil:

    • Substrate induced respiration
    • Chloroform fumigation incubation
    • Chloroform fumigation extraction
    • ATP Determination
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About This Quiz


This quiz is designed to allow you to judge whether you have a basic knowledge of the methods to assess microbial biomass.

Microbial Biomass Methods Review Test - Quiz

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  • 2. 

    This method consists on estimating the maximal respiration rate induced by a substrate, usually glucose, over a short-time period:

    • Substrate induced respiration

    • Chloroform fumigation incubation

    • Chloroform fumigation extraction

    • ATP Determination

    Correct Answer
    A. Substrate induced respiration
    Explanation
    Substrate induced respiration refers to the process of estimating the maximum respiration rate that is induced by a specific substrate, typically glucose, within a short period of time. This method allows researchers to measure the respiratory activity of microorganisms or other biological systems in response to the presence of a particular substrate. By measuring the rate of respiration, scientists can gain insights into the metabolic activity and energy production of the organisms being studied.

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  • 3. 

    This method has been considered to be the standard reference technique to measure microbial biomass in soil:

    • Chloroform fumigation incubation

    • Chloroform fumigation extraction

    • Substrate induced respiration

    • ATP Determination

    Correct Answer
    A. Chloroform fumigation incubation
    Explanation
    Chloroform fumigation incubation is considered the standard reference technique to measure microbial biomass in soil because it involves fumigating the soil with chloroform to kill all the microbes, and then incubating the soil to allow the remaining microbial biomass to decompose the added substrate. By comparing the amount of carbon released from the substrate in the fumigated and non-fumigated soil, the microbial biomass can be determined. This method is widely used and has been validated through numerous studies, making it the preferred technique for measuring microbial biomass in soil.

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  • 4. 

    Suppresion of the respiratory response to glucose in the SIR experiment is also a useful indicator to assess :

    • Toxicity of certain compounds

    • Soil microbial diversity

    • Soil properties

    Correct Answer
    A. Toxicity of certain compounds
    Explanation
    The suppression of the respiratory response to glucose in the SIR experiment can be used as an indicator to assess the toxicity of certain compounds. When the respiratory response is suppressed, it suggests that the compounds present in the soil may be toxic and affecting the metabolic activity of the microorganisms. This can be helpful in identifying and evaluating the potential harmful effects of specific compounds on the soil ecosystem.

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  • 5. 

    Some of the characteristics of the ATP Determination method are:

    • Direct measurements

    • High sensitivity

    • Specific for viable living cells

    • Estimation of macrobial community composition

    • Interference of phosphorus levesl in soil

    Correct Answer(s)
    A. Direct measurements
    A. High sensitivity
    A. Specific for viable living cells
    A. Interference of phosphorus levesl in soil
    Explanation
    The ATP Determination method involves direct measurements, which means that it directly measures the amount of ATP present in a sample. This method is also highly sensitive, meaning that it can detect even small amounts of ATP. It is specific for viable living cells, which means that it can distinguish between living and non-living cells. However, one limitation of this method is that it can be interfered by phosphorus levels in soil, which can affect the accuracy of the results.

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  • 6. 

    These can be categorized as physiological methods to estimate microbial biomass:

    • Chloroform fumigation extraction

    • Chloroform fumigation incubation

    • Substrate induced respiration

    • ATP Determinations

    Correct Answer(s)
    A. Chloroform fumigation incubation
    A. Substrate induced respiration
    Explanation
    Chloroform fumigation incubation and substrate induced respiration are both physiological methods used to estimate microbial biomass. Chloroform fumigation incubation involves treating soil samples with chloroform to kill the microorganisms and then incubating them to measure the release of carbon dioxide, which is an indicator of microbial biomass. Substrate induced respiration, on the other hand, involves adding a substrate to the soil to stimulate microbial activity and then measuring the release of carbon dioxide. Both methods provide insights into the microbial biomass present in a given sample.

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  • Current Version
  • Jun 27, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 09, 2010
    Quiz Created by
    Jimenaes
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