Oil of rosemary does not just repel ticks; it also deters flies, aphids and mites. While oil of rosemary is a tick repellent, it is not the most effective one available. Rose geranium and palmarosa essential oils repel ticks better.
Confidence votes 61. Viruses attach to living cells by binding to the cell receptors. The receptor site is very much like a jig-saw puzzle and the virus must be shaped to fit the site and to lock in. The virus first sticks to the cell membrane of the host cell. The virus then inserts its DNA/RNA into the cell's cytoplasm.
Viruses gain entry and are specific to a particular host cell because portions of the capsid (or spikes of the envelope) adhere to specific receptor sites on host cell plasma membrane. Their nucleic acid then enters the cell, where the viral genome codes for production of protein units in the capsid.iruses are classified by the type of nucleic acid they contain, and the shape of their protein capsule. Examples of several viruses are shown in Figures 1-3. Figure 1. Structure of a variety of viruses.