It is beneficial to study microbial communities in situ because ________.
A. microbes can be studied even if they are nonculturable
B. gene expression may be different in an environmental sample versus an anexic culture
C. in situ studies maintain the relative concentrations of different microorganisms in a sample
D. All of these are reasons to study microbial communities in situ.
Answer: D
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In order to prove that a bacterium is pathological according to Koch’s postulates, the ____
a. bacteria must be present in most cases of the disease b. bacteria must be isolated from the infected host and grown in mixed culture c. specific disease must be induced when a pure culture of the bacteria is introduced into a healthy host d. bacteria must be isolated from a transfer host e. bacterium must produce spores that can be transmitted from one individual to another
Gene flow is the
A) migration of individuals between populations. B) transfer of genes within a population. C) variation of alleles within a population. D) movement of alleles between populations.
Classification.Choose the proper item below for the following statements.
A. This contains regulator, promoter, and operator regions B. A repressor protein can shut down transcription by binding here C. When the repressor is inactivated, RNA polymerase can bind here and allow transcription to occur D. Used in allosteric regulation of the lac operon E. Repressors, activators, and transcription factors
Which of the following statements concerning horizontal gene transfer is most correct?
a. Horizontal gene transfer only occurs in bacteria. b. Horizontal gene transfer occurs through sexual reproduction. c. Horizontal gene transfer has had a major effect on the evolution of life on Earth. d. Horizontal gene transfer has been extremely rare in all lineages. e. Horizontal gene transfer is a hypothetical phenomenon for which there is no actual evidence.