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Botany3

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Chapter 3 Match each structure in List A with one compound from List B. Compounds in List B may be used more than once. List A 1. Tubulin _______ Microtubule 2.chlorophyll _____ Chloroplast 3. rRNA ________ Ribosome 4. Starch________ Amyloplast 5.Pectic compounds__ Cell wall 6. Actin ________ Microfilament 7. Cellulose______ Flagellum 8. Catalse______ Microbody 9.Tubulin______ Centriole 10. Pectic compound__ Middle lamella List B a. Catalase b. Cellulose c. Tubulin d. rRNA e. Chlorophyll f. Starch g. Pectic compounds h. Actin Short Answer If pigments from spinach leaves are separated using a technique called chromatography, five pigments are isolated: 2 green chlorophylls, 2 yellow xanthophylls, and an orange carotene. Why do spinach leaves look green? Ans. Chloroplasts are the pigmented structures that absorb light energy necessary for the photosynthesis. They appear green in colour due to the presence of the pigment known as chlorophyll. The leaves appear in green colour due to the presence of abundant chloroplasts. Chlorophyll is known as the "accessory pigments" because the carotenoids cannot directly transfer the sunlight energy into the photosynthetic pathway, but they first transfer it to chloroplasts. 2. Distinguish between: a). facilitated diffusion and active transport In facilitated diffusion takes place through a concentration gradient whereas active transport incorporates usage of energy as ion and polar molecules moves against concentration gradient. b). in ...
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