Fixation of carbon is accomplished by:
a. photosynthetic organisms.
b. primary consumers.
c. decomposers.
d. bacterial decomposers.
e. burning of organic matter
a
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Competitive exclusion is the result of
a. mutualism. b. commensalism. c. competition. d. predation. e. parasitism.
The term "ecology" is defined as the study of the
A) environment. B) relationships between organisms. C) relationships between organisms and their environment. D) impact of humans on the environment.
Mutations in the lacI and lacO genes of the lac regulatory system in E. coli often lead to full transcription of the three structural genes, even when no lactose is available to the organism. Such mutations would be called ________
Fill in the blank(s) with correct word
Smallpox is a disease in which
A. transmission occurs only by direct skin contact with skin crusts. B. fever, malaise, rash, possible toxemia and shock occurs. C. recurrent episodes are called shingles. D. virus becomes latent in ganglia of sensory neurons. E. All of the choices are correct.