Bio1103 Disease Immunity Practice Questions and Answers
2022 with complete solution
A bacterium contains the following cell structures EXCEPT?
-a chromosome
-a cell membrane
-ribosomes
-a nucleus -Ans- A nucleus
B
...
Bio1103 Disease Immunity Practice Questions and Answers
2022 with complete solution
A bacterium contains the following cell structures EXCEPT?
-a chromosome
-a cell membrane
-ribosomes
-a nucleus -Ans- A nucleus
Bacteria can exchange DNA in which of the following ways (select all that apply):
-Sexual reproduction, or the inheritance of DNA through meiosis and mating
-Transformation, or direct uptake of DNA from the environment
-Transduction, or transfer of DNA by a virus
-Conjugation, or the transfer of DNA from bacterial cell to bacterial cell -Ans- -
Transformation, or direct uptake of DNA from the environment
-Transduction, or transfer of DNA by a virus
-Conjugation, or the transfer of DNA from bacterial cell to bacterial cell
The genome of a virus can be made of which of the following(select all that apply):
-RNA
-DNA
-DNA and RNA
-Protein -Ans- -RNA
-DNA
Viruses require which of the following macromolecules as part of their structure (select
all that apply):
-Lipid
-Nucleic acid
-Protein
-Carbohydrate -Ans- -Nucleic Acid
-Protein
The host range of a virus is determined by ___. (Select all that apply.)
-the proteins on its surface
-whether its nucleic acid is DNA or RNA.
-the proteins on the surface of the host cell.
-the enzymes produced by the virus before it infects the cell. -Ans- -the proteins on its
surface
-the proteins on the surface of the host cell.
Besides using the host cell to replicate its genetic material and protein, an infectious
virus must be able to ___.(select all that apply)
-attach to and penetrate a host cell.-assemble new capsid proteins.
-be released from the host cell. -Ans- -attach to and penetrate a host cell.
-be released from the host cell.
Why are replication-defective viruses good for producing vaccines?
-Infection is restricted to the site of inoculation and the first cells the virus enters, but it
cannot infect more cells.
-The virus can't enter cells, so they can't cause an infection.
-No infection risk because heat has been used to kill the virus.
-The genetic information of the surface of the virus has been altered so that it cannot
express certain genes. -Ans- Infection is restricted to the site of inoculation and the first
cells the virus enters, but it cannot infect more cells.
The following structural characteristic allows HIV viruses to infect human cells.
-Envelope protein
-RNA genome
-Capsid proteins
-Lipid layer -Ans- -Envelope protein
HIV affects activation of cytotoxic T cells by:
-Binding with their CD8 protein
-Preventing their activation by helper T cells
-Attacking B Cells
-Preventing antibody production -Ans- -Preventing their activation by helper T cells
There is a fungus known to kill bacteria. Scientists think that they may have isolated a
compound from the fungus that is responsible for killing the bacteria, which could be a
new antibiotic. They expose the bacteria plated on petri-dishes to the following
treatments:
1. A spray consisting of the fungal spores suspended in water
2. A spray consisting of the compound suspended in water
3. A spray consisting of only water
Which of the three treatments are controls?
-1
-1 & 3
-2 & 3
-3 -Ans- 3
[Show More]
