What sugar is used in the presumptive test?
A) Lactose
B) Glucose
C) Sucrose
D) Dextrose
A) Lactose
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Microorganisms may aggregate and glue themselves to teeth to form dental plaque. This is an example of:
A. a biofilm B. a dentifrice C. halitosis D. a dontoid layer E. annealed enamel
The per capita growth rate of a population is best defined as
A. the change in population size per unit time. B. having a constant value for a particular species. C. per capita birth rate minus per capita death rate. D. growth rate when a population is at equilibrium. E. logistic growth.
Some species of plants cannot interbreed by pollinating each other because the sexual structures of the one species ripen and mature at a different time from the other. This genetic isolating mechanism is
A. geographic. B. seasonal isolation. C. habitat preference. D. behavioral.
In the presence of both lactose and glucose, which of the following occurs with the E. coli lac operon?
A. The lacI gene does not produce repressor. B. The lacZ and lacY genes are fully expressed. C. The cAMP-CAP complex is not available to bind near or at the lac promoter. D. Lactose is converted to glucose and galactose. E. Lactose binds to the operator.