Which of the following types of virus is illustrated in the diagram?

Explanation

The correct option is an animal virus. HIV is a retrovirus that infects human immune cells (CD4+ T cells) and causes AIDS. It has a spherical shape with an RNA genome enclosed in a protein capsid and surrounded by a lipid envelope with glycoprotein spikes, which help it attach to host cells.The options are incorrect: A plant virus, such as Tobacco Mosaic Virus, infects plants and usually has a rod-like or helical shape, not the spherical, enveloped structure seen in HIV. A viroid is even simpler, consisting only of circular RNA without a protein coat, and infects plants, not animals. A bacteriophage has a head-and-tail structure and specifically infects bacteria, which looks very different from HIV. Therefore, the diagram represents an animal virus (HIV).