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
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Mutation is one of the two factors that increase genetic variation
A. true B. false
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
In a typical PCR, primers are used to cleave specific regions of the DNA template
Indicate whether the statement is true or false
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