Cantabria, June 2021, question 6
Question 6 [1.25 POINTS]
Viruses: definition, composition and structure (drawing), lifestyle and role of viruses in nature. Why are viruses not considered living beings in biology?
Extremadura, June 2021, question 7
7.- In relation to viruses:
A. Briefly explain why a virus remains inert if it is not in contact with a host cell (0.5 points).
B. List two differences between viruses and prokaryotes. (0.5 points)
C. Give two arguments for and two against viruses being considered living organisms. (1 point).
Basque Country, June 2021, question 3A
In 2020, he awarded the Nobel Prize in Physiology or Medicine to three scientists, Harvey J. Alter, Michael Houghton, and Charles M. Rice, for their important contribution to the fight against blood-borne hepatitis that causes cirrhosis and liver cancer. This chronic infection, which affects 71 million people worldwide, is caused by the hepatitis C virus.
a) (1 point) Draw a diagram of the structure of a virus and indicate each of its components.
b) (0.5 points) Indicate the main differences between a virus and a bacterium.
c) (0.5 points) How do viruses multiply if their components do not show any metabolic activity? Give reasons for your answer.
d) (0.5 points) Are antibiotics effective in treating diseases caused by a virus? Give reasons for your answer.
Canary Islands, July 2021, question 18
18. A finger prick, a smartphone, and the new $ 34 device created by biomedical engineers at Columbia University (USA) are all it takes to detect the presence of the HIV AIDS virus and Syphilis bacteria Treponema pallidum in the blood. (Source: Science Translational Medicine).
a. Indicates the different types of viral nucleic acids, specify if they are single or double stranded.
b. Why do viruses need to invade a cell to multiply?
c. Viruses have two strategies of action: lytic cycle and lysogenic cycle. What difference is there in the result of each cycle?