Which of the following is not an example of microbial antagonism or competitive exclusion?
A) microbes producing vitamins and growth factors that can be utilized by the host
B) microbes producing acidic compounds that limit the growth of many bacteria
C) microbes utilizing oxygen necessary for the growth of other microbes
D) microbes competing with other microbes for nutrients
E) microbes producing compounds inhibitory to other microbes
Ans: A) microbes producing vitamins and growth factors that can be utilized by the host
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The term axenic is used to describe a(n)
A) anaerobic culture. B) anoxygenic culture. C) nutritionally deficient culture. D) pure culture.
A community of organisms and the physical environment it occupies are known together as a(n)____
Fill in the blank with the appropriate word.
How many viroids are known to cause diseases in commercially valuable plants?
a. 12 b. 46 c. 68 d. 22 e. 30
Which of the following reflects genetic differences?
a. phenotypic variation among organisms b. genotypic variation among organisms c. genotypic and phenotypic variation among organisms d. genotypic and phenotypic variation among populations