I'm studying for my Bio exam (100 questions) and these are some of the questions where I'm not sure about the answer. Please help.
1. How does HIV cause disease?
a. HIV kills brain cells.
b. HIV kills red blood cells.
c. HIV kills cells that defend the body against disease.
d. HIV mutates host DNA and causes cancer.
2. Which replicative cycle describes a virus that can integrate its genome into the host cell's genome?
a. Lysogenic
b. Lytic
c. Mutagenic
d. Viral
3. Which enzyme inserts viral DNA into the host's chromosomal DNA?
a. Protease
b. DNA polymerase
c. Reverse transcriptase
d. Integrase
4. How does HIV bind to a host cell?
a. CD4 binds to a co-receptor on the cell surface.
b. The viral envelope proteins interact with CD4 and a co-receptor on the cell membrane.
c. CD4 binds to the viral capsid on the cell surface.
d. The viral envelope proteins interact with gp120 on the host–cell membrane.
5. Which of the following events stimulates the production of viral particles in a host cell?
a. Processing of viral envelope proteins at the Golgi.
b. Assembly of viral proteins and mRNA molecules.
c. Low-level transcription of viral DNA.
d. Activation of the host cell by cytokines, growth factors, or antigens.
1. How does HIV cause disease?
a. HIV kills brain cells.
b. HIV kills red blood cells.
c. HIV kills cells that defend the body against disease.
d. HIV mutates host DNA and causes cancer.
2. Which replicative cycle describes a virus that can integrate its genome into the host cell's genome?
a. Lysogenic
b. Lytic
c. Mutagenic
d. Viral
3. Which enzyme inserts viral DNA into the host's chromosomal DNA?
a. Protease
b. DNA polymerase
c. Reverse transcriptase
d. Integrase
4. How does HIV bind to a host cell?
a. CD4 binds to a co-receptor on the cell surface.
b. The viral envelope proteins interact with CD4 and a co-receptor on the cell membrane.
c. CD4 binds to the viral capsid on the cell surface.
d. The viral envelope proteins interact with gp120 on the host–cell membrane.
5. Which of the following events stimulates the production of viral particles in a host cell?
a. Processing of viral envelope proteins at the Golgi.
b. Assembly of viral proteins and mRNA molecules.
c. Low-level transcription of viral DNA.
d. Activation of the host cell by cytokines, growth factors, or antigens.
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1)C
because HIV invades and destroys the immune system by damaging the CD4 lymphocytes. As the CD4 cells play a very important role in the functioning of the immune system.
2) is D
because By generating abundant copies of its genome and packaging these copies into viruses, the virus is able to continue infecting new hosts. (Replication)
3)B
4) is B
This video/animation is very informative and will help you for the quiz
http://wps.aw.com/bc_goodenough_boh_3/104/26721/6840590.cw/content/index.html
5) Info to do #5
In a lysogenic cycle viralnucleci acid becomes part of the host cells chromosome and replicate with it. eventrually the virus enters lytic cycle and kills the host cells. Bacterial phage attach to a bacterial host cell by lock in onto specific recepter side on the surface of the host cell virus then insects its DNA into the host cell. Once inside the cell the viral DNA into the cell the viral DNA inserts it self ito a specific side in the chromosome of the host cell viral DNA then called provirus. During cell reporoduction the host cell copys the proviral genes along with on DNA. Provirus is active this time. When the cell devides both host genes and the provirus genes are passed on to the two daughter cells at any time. A proviral may leave the host chromosome and enter the lytic cycle. When this happens the host cell DNAs broken down and new virus parts of produced symbols. Eventually this cell raptures and new virus particle was released viral reproductive cycle which the virus takes over all metobolic activities of still replicate it many times then destory the host cell. Bacterial phage attack to bacterial host cell by recongnizing on the specific side on the surface of the host cell. The virus then inject in DNA into the host cell. The empty code remains outside the host cell
s DNA the virus then takes the total metabolic activities of the host cell by using the role materials present in the cell. The viral DNA directs the production of new virals parts. The newly produced viral components are simple into complete new virus particles. The host cell burst to open releases 100-200 virus praticles. The new particles began other cycle infecting new viral cells.
because HIV invades and destroys the immune system by damaging the CD4 lymphocytes. As the CD4 cells play a very important role in the functioning of the immune system.
2) is D
because By generating abundant copies of its genome and packaging these copies into viruses, the virus is able to continue infecting new hosts. (Replication)
3)B
4) is B
This video/animation is very informative and will help you for the quiz
http://wps.aw.com/bc_goodenough_boh_3/104/26721/6840590.cw/content/index.html
5) Info to do #5
In a lysogenic cycle viralnucleci acid becomes part of the host cells chromosome and replicate with it. eventrually the virus enters lytic cycle and kills the host cells. Bacterial phage attach to a bacterial host cell by lock in onto specific recepter side on the surface of the host cell virus then insects its DNA into the host cell. Once inside the cell the viral DNA into the cell the viral DNA inserts it self ito a specific side in the chromosome of the host cell viral DNA then called provirus. During cell reporoduction the host cell copys the proviral genes along with on DNA. Provirus is active this time. When the cell devides both host genes and the provirus genes are passed on to the two daughter cells at any time. A proviral may leave the host chromosome and enter the lytic cycle. When this happens the host cell DNAs broken down and new virus parts of produced symbols. Eventually this cell raptures and new virus particle was released viral reproductive cycle which the virus takes over all metobolic activities of still replicate it many times then destory the host cell. Bacterial phage attack to bacterial host cell by recongnizing on the specific side on the surface of the host cell. The virus then inject in DNA into the host cell. The empty code remains outside the host cell
s DNA the virus then takes the total metabolic activities of the host cell by using the role materials present in the cell. The viral DNA directs the production of new virals parts. The newly produced viral components are simple into complete new virus particles. The host cell burst to open releases 100-200 virus praticles. The new particles began other cycle infecting new viral cells.
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What level of Biology is this?