A) examine the centrifuge for the presence of extracts of chloroplasts
B) answer immediately that the cells were from a plant source
C) examine the centrifuge for the presence of extracts of centrioles
D) answer immediately that the cells were from an animal source
Correct Answer: D
Solution :
Glycogen or animal starch, is a major reserve food of animals some fungi and some bacteria. It is not present in plant cells. Glycogen is stored in liver and muscles. Glycogen is formed in situ from glucose through the process of condensation called glycogenesis. In cells it appeas as ellipsoid flattened granules, chemically, it is similar to starch, having about 30,000 glucose residues, which are arranged in highly branched chains. Straight parts have \[\alpha (1\to 4)\]linkages whereas branches have \[\alpha (1\to 6)\] linkages. Glycogen is readily hydrolyzed to glucose by glycogenolysis. Hence, presence of glycogen in the centrifused residue is indicative of an animal cell.
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