In the field of plant transgenics, the use of the bacterium Agrobacterium tumefaciens has proven usefulbecause:a
it is not attacked by plant immune systems.
b. it has been genetically engineered to penetrate the plant cell wall.
c. it can directly modify the plant genome, causing it to make useful products for humans.
d. it is found naturally in almost all species of plants.
e. it is able to transfer a plasmid into host plant cells.
E
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The transcription terminator
A. results in a hairpin loop structure in RNA. B. results in the polymerase falling off the DNA template. C. stops DNA polymerase. D. adds a terminator nucleotide to the RNA. E. results in a hairpin loop structure in RNA AND results in the polymerase falling off the DNA template.
Which answer best describes energy flow in biological systems as described in the text?
a. glucose ? G3P ? NADH ? ATP b. bacteria ? archaea ? plants ? animals c. NAD+ ? NADH ? ADP ? ATP d. G3P ? glucose ? ATP ? NAD+ e. pyruvate oxidation ? glycolysis ? fermentation ? citric acid cycle
Which zone does not occur in the sandy beach?
a. resurgence b. drying sand c. saturation d. retention e. maintenance
Species that have a delayed reproductive stage, are competing for limited resources, and have smaller numbers of slowly maturing large offspring show ________ adaptations.
A. r-selected B. K-selected