Which of the following statements about hypersensitivity is not accurate? Hypersensitivity occurs in the presence of an antigen. Hypersensitivity is synonymous with "allergy." Hypersensitivity requires previous exposure to an antigen. Hypersensitivity occurs when an individual is exposed to an allergen for the first time. Hypersensitivity is due to an altered immune response.The ABO blood typing system is based on the presence of specific sugars on the outside of red blood cells, whereas the Rh status is based on the presence of absence of the Rh protein on the outside of the red blood cells. Which antibodies will be in the serum of a person with blood type B, Rh-positive? anti-B anti-A anti-A, anti-Rh anti-A, anti-B, anti-Rh anti-B, anti-RhHemolytic disease of the newborn can result from an AB mother carrying an O fetus. Rh-negative mother carrying an Rh- positive fetus. AB mother carrying a B fetus. Rh-negative mother carrying an A fetus. Rh-positive mother carrying an Rh-negative fetus.In rheumatoid arthritis, IgM, IgG, and complement deposit in joints. This is an example of immune complex autoimmunity. acquired immunodeficiency. cytotoxic autoimmunity. cell-mediated autoimmunity. immunosuppressionAssuming Rh compatibility is present, individuals with which of the following blood tpes would be able to receive donor blood from any of the four blood types ( A,B,AB, and O) ? A AB BWhich of the following best describes graft-versus-host disease? Immune cells attach transplanted tissue in a privileged site. Immune cells in transplanted bone marrow attack the cells of the host. A tissue transplant is rejected because the host's T cytotoxic cells are activated and kill the transplanted tissue. The cells of a host reject transplanted bone marrow.Why is it more difficult to treat viral infections than it is to treat bacterial infections? Viruses use the host cell's processes to carry out their own reproduction. Viruses are very similar to human cells. Viruses are smaller than human cells. Viruses have cell walls.In the presence of penicillin, a gram-positive cell dies because it lacks a cell membrane. its contents leak out due to holes in the cell membrane. it undergoes lysis due to osmosis. it plasmolyzes (the cell membrane separates from the cell wall as water exits the bacterial cell). it lacks a cell wall.Drug resistance occurs against antibiotics and not against synthetic chemotherapeutic agents. when antibiotics are used indiscriminately. All of the answers are correct. when antibiotics are taken after the symptoms disappear. because bacteria are normal microbiotaSulfanilamides interfere with protein synthesis in helminths. protein synthesis in fungi. folic acid synthesis in bacteria. anaerobic metabolism in protozoa..

1. Which of the following statements about hypersensitivity is not accurate? Hypersensitivity occurs
in the presence of an antigen. Hypersensitivity is synonymous with "allergy." Hypersensitivity
requires previous exposure to an antigen. Hypersensitivity occurs when an individual is exposed to
an allergen for the first time. Hypersensitivity is due to an altered immune response.The ABO
blood typing system is based on the presence of specific sugars on the outside of red blood cells,
whereas the Rh status is based on the presence of absence of the Rh protein on the outside of the
red blood cells. Which antibodies will be in the serum of a person with blood type B, Rh-positive?
anti-B anti-A anti-A, anti-Rh anti-A, anti-B, anti-Rh anti-B, anti-RhHemolytic disease of the
newborn can result from an AB mother carrying an O fetus. Rh-negative mother carrying an Rh-
positive fetus. AB mother carrying a B fetus. Rh-negative mother carrying an A fetus. Rh-positive
mother carrying an Rh-negative fetus.In rheumatoid arthritis, IgM, IgG, and complement deposit in
joints. This is an example of immune complex autoimmunity. acquired immunodeficiency. cytotoxic
autoimmunity. cell-mediated autoimmunity. immunosuppressionAssuming Rh compatibility is
present, individuals with which of the following blood tpes would be able to receive donor blood
from any of the four blood types ( A,B,AB, and O) ? A AB BWhich of the following best describes
graft-versus-host disease? Immune cells attach transplanted tissue in a privileged site. Immune
cells in transplanted bone marrow attack the cells of the host. A tissue transplant is rejected
because the host's T cytotoxic cells are activated and kill the transplanted tissue. The cells of a
host reject transplanted bone marrow.Why is it more difficult to treat viral infections than it is to
treat bacterial infections? Viruses use the host cell's processes to carry out their own reproduction.
Viruses are very similar to human cells. Viruses are smaller than human cells. Viruses have cell
walls.In the presence of penicillin, a gram-positive cell dies because it lacks a cell membrane. its
contents leak out due to holes in the cell membrane. it undergoes lysis due to osmosis. it
plasmolyzes (the cell membrane separates from the cell wall as water exits the bacterial cell). it
lacks a cell wall.Drug resistance occurs against antibiotics and not against synthetic
chemotherapeutic agents. when antibiotics are used indiscriminately. All of the answers are
correct. when antibiotics are taken after the symptoms disappear. because bacteria are normal
microbiotaSulfanilamides interfere with protein synthesis in helminths. protein synthesis in fungi.
folic acid synthesis in bacteria. anaerobic metabolism in protozoa.