Why is it important that a few ?-galactosidase molecules be present in E. coli even if these cells have
been growing on a lactose-free medium? What will be an ideal response?
Concepts to Consider: It is important so that when lactose is present, some of it will be converted to
allolactose, which induces the lactose operon.
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The underlying phenomenon that makes selective breeding or artificial selection possible is genetic variation. It is possible to have phenotypic variation in natural populations because of....
A. artificial selection. B. gene inversion. C. differences in alleles for a specific trait. D. similarity in alleles for a specific trait. E. both artificial selection and gene inversion.
Shake tubes are used to determine the
A. pH requirements for bacterial growth. B. temperature requirements for bacterial growth. C. oxygen requirements for bacterial growth. D. salt requirements for bacterial growth.
The type of biome characteristic of an area depends mainly on ____
a. latitude and prevailing winds b. prevailing winds and ocean currents c. soil composition and types of consumers d. topology and latitude e. rainfall and temperature
When one microbe's metabolic activities create favorable conditions for another microorganism, this is referred to as (competition/cooperation/facilitation)
What will be an ideal response?