What component is common for all viruses?

Which of the following is not a described type of virus?

I. A virus containing double strand DNA

II. A virus containing single strand DNA

III. A virus containing single strand RNA and single strand DNA

IV. A virus containing single strand RNA

V. A virus containing double strand RNA

What molecule would you not expect to find in a retrovirus?

Sexually transmitted diseases are a common problem among young people in the United States. One of the more common diseases is caused by the bacterium Neisseria gonorrhoeae, which leads to inflammation and purulent discharge in the male and female reproductive tracts.

The bacterium has a number of systems to evade host defenses. Upon infection, it uses pili to adhere to host epithelium. The bacterium also uses an enzyme, gonococcal sialyltransferase, to transfer a sialyic acid residue to a gonococcal surface lipooligosaccharide (LOS). A depiction of this can be seen in Figure 1. The sialyic acid residue mimics the protective capsule found on other bacterial species.

Once infection is established, Neisseria preferentially infects columnar epithelial cells in the female reproductive tract, and leads to a loss of cilia on these cells. Damage to the reproductive tract can result in pelvic inflammatory disease, which can complicate pregnancies later in the life of the woman.

Which of the following is true of Neisseria, but not true of a virus?

Which of the following is not a component of HIV?

Which of the following best describes retroviral DNA that has been incorporated into a host genome?

Which of the following statements describes a lysogenic infection?