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The major difference between plant and animal cells is that plant cells have cell walls and chloroplasts , and animal cells do not . According to James C. Anthony , a professor of mental hygiene , psychiatry and epidemiology , " This large difference between marijuana smokers and nonsmokers may be attributed to the social influences in a marijuana smoker 's life . He noted the similarities and differences between lake and marine sediments and biota and approaches to their study . As noted above , despite the recent amendments to Regulation T , 190 there remain several differences between Regulation T and Regulation U. 191 For example , the two regulations differ with respect to the margin requirements for short OTC options . The difference between plant remains that had been charred and those that had simply been dried allowed me to determine what had once lain on the floor of the grave and what had been above it , even though the archaeological context was quite disturbed . Our initial observations of differences in signaling between agonist peptide and thrombin activation , the ability of PARs to interact with each other and the heterogeneous expression patterns of the PARs within the vasculature lead us to pose a second hypothesis that differences between agonist peptide and thrombin signaling arise from differences in the ability of the receptors to homo - or hetero-dimerize . 35 However , several differences between Regulation T and Regulation U still remain , such as margin requirements for short OTC options .