Final answer:
Influenza, measles, and mumps viruses are known for their ability to clump red blood cells, a characteristic studied using hemagglutination assays. They are not associated with several other viral attributes such as infecting bacteria, forming Negri bodies in the brain, causing cancer, or existing solely in horses.
Step-by-step explanation:
The viruses of influenza, measles, and mumps are known for their ability to clump red blood cells. This is due to a process known as hemagglutination, which is the agglutination of red blood cells and is a property of certain viruses, including the influenza virus. The influenza virus has particular proteins on its surface, known as hemagglutinins, which can bind to receptors on red blood cells, causing them to clump together. This is a characteristic feature of influenza viruses as well as other viruses such as mumps and measles, where the direct hemagglutination assay (HA) can be used for detection.
Unlike bacteriophages like T4, which infect bacterial cells, influenza, mumps and measles viruses do not multiply within bacteria. These viruses are also not particularly known to form Negri bodies in brain cells like the rabies virus, nor are they known chiefly for causing cancer, which is associated with certain oncogenic viruses like specific herpesviruses and hepatitis B virus. Lastly, these viruses are not exclusively existent in animals such as horses, although influenza A viruses can infect a range of animal species including horses.