Which of the following can be used to estimate the number of microorganisms in a culture?

A. Measurements of microbial biomass
B. Direct counts of microbial cells
C. Counts of viable cells using colony growth procedures
D. All of the choices are correct.


Answer: D

Biology & Microbiology

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A. true B. false

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What ultimately is the greatest threat to

biodiversity?

a. plant pathogens b. exotic species c. unthinking humans d. mineral and energy use e. conservation efforts

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In a typical PCR, primers are used to cleave specific regions of the DNA template

Indicate whether the statement is true or false

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Consider the thermodynamic properties of chemical reactions. Even though enzymes do not affect the overall energy of the reactants or the products ( the thermodynamics), they alter the speed of the reaction. Enzymes accomplish this by doing which of the following?

A.) increasing the activation energy of a reaction B.) not altering the activation energy of a reaction C.) reducing the activation energy of a reaction D.) eliminating the activation energy of a reaction E.) supplying the activation energy for a reaction

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