Patent protection for design patents only lasts for 14 years after the patent is granted, so they offer six years less protection than other patent types. Unlike plant and utility patents, however, no maintenance fee is required to keep a design patent active.
A virus is a small, infectious agent that is made up of a core of genetic material surrounded by a shell of protein. The genetic material (which is responsible for carrying forward hereditary traits from parent cells to offspring) may be either deoxyribonucleic acid (DNA) or ribonucleic acid (RNA).
list and describe the structural components of viruses. - capsid built from capsomeres encloses the viral genome-some viruses have accessory structures to help them infect their hosts-membranous envelope surrounds the capsids of flu viruses-elongated icosahedral capsid heads and protein tail pieces are on t-even phages.xplain how viral infections may cause disease. - some viruses damage or kill cells by triggering the release of hydrolytic enzymes from lysosomes-some viruses cause the infected cell to produce toxins that lead to disease symptoms-other viruses have molecular components, such as envelope proteins, that are toxic.