Characteristics do bacteria and viruses share

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Reference no: EM133933399

Questions

1. Sleeping sickness, more formally known as African trypanosomiasis, is a potentially deadly disease caused by Trypanosoma brucei, a protozoan spread by the bite of the tsetse fly. This is an example of which type of transmission mode?

(A) Inanimate vector

(B) Fecal-oral transmission

(D) Biological vector

2. A recent study indicates that the SARS-CoV-2 virus may remain viable on glass surfaces like a phone screen for a significant period of time (several days). Thus, even though aerosols remain the primary transmission mechanism for the virus, doctors argue that people could also be infected by touching contaminated surfaces and then their mouths. Contracting a disease by touching a surface is an example of what type of transmission mode?

(A) Inanimate vector

(B) Fecal-oral transmission

(D) Biological vector

3. Which of the following is an example of direct transmission of COVID-19?

(A) A susceptible person is infected when they touch a doorknob on which the virus was previously deposited.

(B) A susceptible person is infected by the bite of an insect that previously bit an infected person.

(D) A susceptible person is infected by drinking water containing the virus.

4. Which treatment would you expect to be most effective in fighting COVID-19 infections, the disease caused by the coronavirus SARS-CoV-2?

(A) Antibiotics that directly target the pathogen as it invades the host

(B) A vaccine that primes the host's immune system to recognize the antigens of the virus

(D) Using compounds sold as drugs or supplements by non-medical professionals

5. Which of the following characteristics do bacteria and viruses share?

(A) They contain nucleic acids and proteins.

(B) They reproduce by binary fission.

(D) They rely on host cells to reproduce.

6. How do viruses such as SARS-CoV-2 (the virus that causes COVID-19) reproduce?

(A) Viruses grow and reproduce as free-living organisms, using resources from the environment until their populations are too dense, at which point they infect hosts.

(B) Viruses feed on nutrients within their host, grow larger, and then divide through binary fission to create two daughter cells from one single parent cell.

(C) Viruses inject their genetic material (DNA or RNA) into a host cell, where it co-opts the host cell's replication machinery to synthesize more viral particles.

(D) Viruses use biological vectors, which inject viral germ cells into a mammalian host. These cells travel to the host's liver, mature, and then reproduce.

7. Ebola is a virus that spreads through direct contact with body fluids from an infected person. A vaccine was developed shortly after an outbreak in 2013. Unfortunately, public health officials didn't have the vaccine during the outbreak. Instead, they implemented a strict quarantine on infected individuals. How do quarantines affect the spread of disease?

(A) Quarantining infected individuals reduces the number of susceptible individuals in a population.

(B) Quarantining infected individuals reduces the rate of contact with susceptible individuals.

(D) Quarantining infected individuals reduces the critical immunization threshold, pc.

Reference no: EM133933399

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