Which characteristic is least applicable to the development of science?
a. evaluation of data
b. personal conviction
c. prediction
d. systematic observation
e. sharing of ideas
ANSWER: b
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After mutagenesis, the nitrogen-fixing bacterium Sinorhizobium meliloti could no longer colonize Medicago truncatula plants. This inability to colonize was due to the absence of recognition by the host plant
Which of the following genes is most likely the site of the mutation in these bacteria? A) nitrogenase B) flavonoid-synthesizing enzyme C) Nod factors D) leghemoglobin E) peptidoglycans of the bacterial cell wall
What is the difference between a primary and a secondary source?
A. A primary source is the raw data before scientists publish, whereas a secondary source is a description of the original material. B. A primary source is the original material published by the scientists, whereas a secondary source is a description of the original material. C. A primary source is the original material published by the scientists, whereas a secondary source is the raw data before scientists publish. D. There is no difference between primary and secondary sources.
Which of the following statements about Hfr cells and bacterial conjugation is false?
A. An Hfr cell becomes an F- cell if its integrated F plasmid is excised. B. If excision of the F plasmid from an Hfr cell includes some bacterial genes, a partial diploid can result. C. The genes that are transferred from an Hfr cell into a recipient cell during conjugation replace the equivalent genes in the recipient cell. D. An F' plasmid contains some bacterial genes. E. Cells with integrated F' plasmid have two copies of some genes.
What is meant by a gene knockout?
What will be an ideal response?