Cell-to-cell contact is required for transduction to occur
Indicate whether the statement is true or false
FALSE
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Which one of the following contributes to the utility of the strains of Salmonella typhimurium used in the Ames reversion assay?
A. They are highly permeable to test substances. B. It is very straightforward to assay the conversion of their histidine auxotrophy mutations to histidine prototrophy. C. They are defective in DNA repair and, therefore, cannot readily repair damage done by the test substances. D. All of the choices are correct.
Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex. B. releasing vesicles containing perforin. C. activating natural killer cells. D. opsonization. E. secreting cytokines.
Meiosis is necessary if
A. the chromosome number of a sexually reproducing species is to remain the same generation after generation. B. life is to continue on the planet. C. all organisms of a species are to remain the same. D. mutations are to be stopped.
A biologist is studying the population dynamics of pocket gophers in a meadow in central Oregon. She noted that, when population numbers are high, death rates from disease and starvation increase. This is an example of:
A) r-selected growth. B) the principle of intrinsic rate of growth. C) density dependent control. D) exponential growth.