The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward).
Plants inherit genes that enable them to produce chlorophyll, but this pigment is not produced unless the plants are exposed to light. this is an example of how the environment can influence on gene expression.
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Light has an important role in gene expression in plants by producing a number of light-induced changes. One of the examples of the light effects is that chlorophyll and the proteins required for assembling the photosynthetic apparatus are synthesized together with the enzymes needed for carbon fixation. Gene expression influenced by light includes the regulation at the level of transcription or, alternatively regulation of translation.</span>
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i think that if you use antibiotics your body wouldn't get exposed to the bacteria as much as if you got sick, making your body more dependent on the meds because your body hasn't produced the antibody's against the bacteria
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