A-LevelBiologyCell structureOct/Nov 2018Paper 2 Q111 Marks
Aphids are small insects which feed directly on phloem sap. The salivary glands of aphids have secretory cells that make and release a variety of proteins that assist in feeding. Fig. 1.1 is a transmission electron micrograph of a small area of a salivary gland cell of an aphid. [Figure 1.1]
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