A culture of E. coli bacteria is used to establish several subcultures. Each subculture is then plated and individulal colonies that grow on the agar plates are then tested for their sensitivity to the bacteriophage T1
There is a spectrum of sensitivities where some plates have a high number of resistant colonies and some plates had very few. This data supports which theory?
A. Physiological adaptation theory
B. Random mutation theory
C. Both theories
D. Neither theory
B
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If a protein to be overexpressed is toxic to the expression host, it is best to select an expression vector that
A) is compatible with a binary vector able to be regulated. B) is inducible. C) has a relatively low copy number per cell. D) prevents folding of the overexpressed protein into its toxic form.
Which of the following is(are) true about a zebrafish that glows in the dark because its DNA
contains and expresses the firefly gene for bioluminescence?
a. It is a transgenic organism. b. It has been genetically engineered. c. Its DNA profile has been determined. d. It is a transgenic organism, and it has been genetically engineered.
The molecule shown above is ____, having ____
a. unsaturated; a carbon-carbon double bond b. saturated; a carbon-carbon double bond c. unsaturated; no carbon-carbon double bonds d. saturated; no carbon-carbon double bonds e. saturated; a carbon-carbon triple bond
The definitive host of a parasite is
A. the host for immature stages of the parasite. B. where the mature form of the parasite occurs. C. also the vector for the parasite. D. the host that the parasite name is based on. E. the host for the dormant stage of the parasite.