John snow, in snow on cholera: a. established postulates for transmission of infectious disease. b. was the father of modern biostatistics. c. was an english anesthesiologist who used natural experiments. d. was a london surgeon who identified an environmental cause of cancer. e. argued that the environment was associated with diseases such as malaria.

After mork has gone through one full sleep cycle, his heart beats faster, his breathing grows fast and irregular, and his closed eyes begin to move back and forth. a researcher who is monitoring mork’s eeg activity will most likely see waves.

The herpes viruses are important enveloped dna viruses that cause disease in vertebrates and in some invertebrates such as oysters. some of the human forms are herpes simplex virus (hsv) types i and ii, causing facial and genital lesions, and the varicella zoster virus (vsv), causing chicken pox and shingles. each of these three actively infects nervous tissue. primary infections are fairly mild, but the virus is not then cleared from the host; rather, viral genomes are maintained in cells in a latent phase. the virus can later reactivate, replicate again, and infect others.in electron micrographs of hsv infection, it can be seen that the intact virus initially reacts with cell surface proteoglycans, then with specific receptors. this is later followed by viral capsids docking with nuclear pores. afterward, the capsids go from being full to being "empty." which of the following best fits these observations? a) viral capsids are needed for the cell to become infected; only the capsids enter the nucleus.b) the viral envelope is not required for infectivity, since the envelope does not enter the nucleus.c) only the genetic material of the virus is involved in the cell's infectivity, and is injected like the genome of a phage.d) the viral envelope mediates entry into the cell, the capsid mediates entry into the nuclear membrane, and the genome is all that enters the nucleus.

What is the medical term for the middle ear not being able to conduct sound vibrations to the inner ear