| 21. | Primary cells are most economical for infrequent use.
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| 22. | It has been successfully tested on a broad range of cell lines, hard-to-transfect and primary cells.
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| 23. | Zinc carbon dry cells are single-use primary cells.
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| 24. | In primary cells the positive and negative electrodes are known as the cathode and anode, respectively.
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| 25. | Pectin is an important cell wall polysaccharide that allows primary cell wall extension and plant growth.
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| 26. | The primary cell wall of land plants is composed of the polysaccharides cellulose, hemicellulose and pectin.
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| 27. | Primary cells cannot divide indefinitely and thus cannot be cultured for long periods of time in vitro.
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| 28. | Primary cells, for example stem cells, especially fall into this category, although many other medical research purposes.
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| 29. | The major polysaccharides making up the primary cell wall of land plants are cellulose, hemicellulose, and pectin.
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| 30. | These " primary cells " can then be further expanded and transferred into fresh dishes through micropropagation.
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