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- QUESTION 3 Which BEST describes why it is difficult to develop antiviral drugs? Oa Antivical drugs are vory easy to develop and have no sido effects. Ob. Viruses are too small to be targeted by drugs Oc Viruses are hard to target because they use the host cell's enzymes and ribonomes to metabolize and roplicate Od. Viral infections usually clear up on their own with no problems QUESTION 4 Which of the following has ylelded microbes that produce compounds with the most antimicroblal activity? O sll the arctic O human GI tract the oceanwhich of the following is NOT a mechanism by which viruses can damage the human body (ie- harm us)? causes our viral infections may lead to the release of too much cytokines/chemical signals O may cause our defenses/immune system to over-react Othey produce and release toxins O may cause cancer Otheir replication (life cycle) destroys our cellsWhy are viruses NOT considered living organisms? They are not composed of cells They cannot reproduce on their own They have no nucleus all of the above
- You have a discussion among friends about viruses that can cause latent and chronic infections in humans. The first friend says that an example for latent infections in humans are oral and genital herpes caused by herpes simplex virus and that examples of viruses causing chronic infections are Hepatitis C and HIV. The second friend says oral and genital herpes as well as chickenpox/ shingles are chronic infections and that HIV is an example for a virus causing a latent infection. O The first person is correct O The second person is correctWhich one of the following is not true for virus, obligate intracellular parasites? Viruses cannot generate energy outside of cells Viruses cannot synthesize proteins outside of cells Enveloped viruses require host cell membrane to obtain their envelopes Viruses must degrade host cell DNA in order to obtain nucleotidesWhat is true about the difference between prions and viruses? Viruses have genomes composed of RNA, whereas prions have genomes composed of DNA. Viruses have capsids composed of protein, whereas prions are made only of nucleic acid. Viruses infect many types of cells, whereas prions infect only prokaryotic cells. Viruses generally cause disease symptoms quickly, whereas prions generally take many years to cause disease symptoms.
- All viruses have which components in their infectious particles? O Nucleic acids, protein coats, and ribosomes O Nucleic acids and protein coats O Nucleic acids, protein coats, and membranes O Protein coats only MacBook Air 吕0 000 000 F7 F6 F5 F3 F4The virion illustrated below is a O Bacteriophage O poxvirus O HIV retrovirus O AdenovirusViruses are different enough from other organisms that they can be considered living or non- living. A non-living aspect of viruses is Their DNA does not encode proteins. They do not evolve. They do not carry out metabolic processes. They have RNA rather than DNA.
- A scientist discovers a new virus with a linear, RNA genome surrounded by a helical capsid. The virus is most likely a member of which family based on structure classification? Rabies virus Herpesviruses Retroviruses Influenza virusesWhich is true of DNA viruses? They use the host cell's machinery to produce new copies of their genome They all have envelopes They are the only kind of viruses that can cause cancer They are not important plant pathogens.Which of the following statements concerning viruses and human health is false? a-in many diseases caused by viruses, the virus attacks cells as it reproduces b- many viral diseases can be controlled through vaccinations c- some viruses can remain dormant in the body for years before disease symptoms appear d-most viral infections are difficult to treat, but they can be finally destroyed by antibiotics