1- Viruses are dangerous because a- They can be immediately fatal as s.pdf

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1. Viruses are dangerous because a. They can be immediately fatal as seen with Ebola. b. They can remain in your body and cause outbreaks for the rest of your life as seen in herpes. E. They can cause cancer as seen in HPV. d. Both A and B are correct e. All of the statements are correct. 2. A researcher is trying to decide if a bacteria or virus causes a particular disease. The researcher extracted serum. from an infected mouse, passed it through a fiiter where the pore size was 120 nm, and injected the filtered serum into a mouse. If the newly injected mouse develops this particular disease, does this indicate a viral pathogen? a. Yes, because no bacteria could fit through the filter b. No, because bacteria and viruses are about the same size c. You cannot make a determination based on the information provided. 3. One way in which retroviruses differ from all other types of viruses is that retroviruses .. a. Have a protein capsid b. Are not cellular c. Have the enzyme reverse transcriptase d. Possess an RNA genome e. Possess a DNA genome 4. Once a prophage is present in a bacterial genome, viral genes are reproduced every time the bacterium multiplies. The expression of viral genes, however, is inhibited by a repressor protein. Cell stress can induce the formation of proteases that degrade the repressor. What will result? a. The virus will enter the lysogenic cycle. b. The bacterium will reject the viral genes. c. The virus will enter the lytic cycle. d. The bacterial genome will be denatured. 5. Most viruses form a capsid around their nucleic acid core. This capsid is composed of a. proteins. b. monosaccharides. c. Elycoproteins d. lipoproteins. 6. HiV studies revealed that it is closely related to a. smallpox virus. b. Ebola virus. c. herpes virus. d. a chimpanzee virus. e. mad cow disease. 7. If you found a worm on the forest floor, what would be the easiest way to decide if it were a nematode or an annelid? a. Look for the coclom b. Look for segments c. Look at the type of symmetry d. Count the number of embryonic tissue layers e. Find out what happened to its blastopore.

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