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Micro Bio Exam 2

QuestionAnswer
How do all viruses differ from bacteria? Viruses are not composed of cells
A feature that may be found in viruses but never in bacteria is.... may contain an RNA genome
Which of the following statements about viruses is false? Viruses use their own catabolic enzymes
Which of the following statements about viral spikes is false? They are found only on nonenveloped viruses
The morphological types of viruses illustrated in the figure are ultimately determined by the ... nucleic acid
Viruses that utilize reverse transcriptase belong to the virus families ... Hepadnavorode amd retroviridae
Which of the following is not utilized to culture viruses? Culture media
A clear area against a confluent "lawn" of bacteria is called a plaque
The definition of lysogeny is ... phage DNA is incorporated into host cell DNA
Lysogeny can result in all of the following except immunity to reinfection by any phage
An envelope is acquired during which of the following steps? release
A virus's ability to infect an animal cell depends primarily upon the ... presence of receptor sites on the cell membrane
The mechanism whereby an enveloped virus leaves a host cell is called ... budding
The following steps occur during multiplication of herpesviruses. Which is the third step? Uncoating
The most conclusive evidence that viruses cause cancers was provided by .... cancer that developed in chickens following injection of cell-free filtrates
Oncogenic viruses ... cause tumors to develop
What is an oncogene? an altered form of a gene that may induce cancer
What is the key characteristic of a transformed cell? has acquired tumor-forming properties
Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms. These are called ... latent viruses
A persistent infection is one in which ... The disease process occurs gradually over a long period
An example of a latent viral infection is... cold sores
Shingles is an example of ... reactivation of a latent virus
A viroid is a(n) ... infectious piece of RNA without a capsid
Which of the following is necessary for replication of a prion? PrP^Sc
An infectious protein is a ... Prion
Which of the following statements regarding metabolism is false? Anabolic reactions are degradative
Which of the following compounds is NOT an enzyme? Coenzyme A
Which of the following is the best definition of oxidative phosphorylation? A proton gradient allows hydrogen ions to flow back into the cells through transmembrane protein channels, releasing energy that is used to generate ATP.
Which of the following statements about photophosphorylation is false? It requires CO2
What is the fate of pyruvic acid in an organism that uses aerobic respiration? It is converted into acetyl CoA
Which of the following is the best definition of fermentation? the partial oxidation of glucose with organic molecules serving as electron acceptors
Which of the following statements regarding the Entner-Doudoroff pathway is true? NADH and ATP are generated
Which of the following statements regarding the glycolosis pathway is false? One molecule of ATP is expended
Which of the following uses CO2 for carbon and H2 for energy? Chemoautotroph
Salts and sugars work to preserve foods by creating a ... hypertonic environment
Most bacteria grow best at pH ... 7
Most fungi grow best at pH ... 5
Which of the following pairs of microbe classification terms and optimal growth temperatures is mismatched? thermophile- growth at 37 C
Which of the following is an organic growth factor? Vitamin B1
Which of the following is an advantage of the direct microscopic count? Requires no incubation time
Most bacteria reproduce by ... Binary Fission
Which of the following is the best definition of generation time? the length of time needed for a cell to divide
Created by: cb155987
 

 



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