Which structure helps bacteria attach to surfaces and protects them from the host immune system?

Which structure is commonly found in Gram-negative bacteria but not in Gram-positive bacteria?

Which bacterial group includes many medically important species such as E. coli and Salmonella?

Which microscope made it possible to visualize viruses?

Which factor determines which cells a virus can infect?

A complete virus particle is known as a:

Which structure allows bacteria to survive extreme environmental conditions?

Which statement best describes why viruses are considered obligate parasites? 

All viruses contain which of the following components? 

In patients with early chronic renal failure which of these is likely to be present