AP Biology : Microorganisms and Viruses
Study concepts, example questions & explanations for AP Biology
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Example Questions
Example Question #28 : Understanding Viruses And Prions
Which of the following is characteristic of viruses?
Lipid bilayer outer membrane
A protein coat
Thick peptidoglycan cell wall
Membrane bound organelles (e.g., Golgi apparatus)
Cell wall made of chitin
A protein coat
Viruses are unique organisms in that they have a relatively simple cell structure. They have an outer protein coat, which sets them apart from other organisms. Peptidoglycan is found in bacteria, lipid bilayer is found in eukaryotic cells, and chitin is found in fungi. Membrane-bound orangelles are found in more complex cells, such as eukaryotic cells, and are not unique to viruses.
Example Question #31 : Understanding Viruses And Prions
Successful reproduction of a lytic virus requires all of the following except which of these?
Replication of the viral genome
Entry of the virus into the host cell
Binding of the virus to the host cell
Incorporation of viral DNA into host DNA
Translation of viral DNA
Incorporation of viral DNA into host DNA
A lytic virus does not require incorporation into the host cell's DNA. Instead, a lytic virus must attach to it's host cell and enter. Once the virus enters, it can take over the hosts' cellular proteins to replication. After replication, the copies will burst from the host cell and spread throughout the extracellular environment.
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