What is the function of the flat epithelial cells present in the structures labelled by the stars? 100 pm nswers A- E A Lining of the majority of the surface and regulation of gas exchange Prevention of collapse of the lumen Production and secretion of surfactant Reserve cells for immune function and antigen presentation E The same function as goblet cels have in bronchi

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Viral Infections

Viruses are abundantly found, minute entities that have genetic material enclosed within a protein coat. The proteinaceous material enclosing the genetic material of the virus is called a capsid. The genetic material could be either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). A virus is too minute to be looked at with naked eyes and therefore visualized with the help of a microscope. They are acellular entities that require a host for processes, such as replication, transcription, translation and multiplication. Plants, animals, and bacteria act as host wherein the virus reproduce. Viruses cannot multiply outside the host's body and thus are considered nonliving outside the host body.