Explain why passive immunization is not effective in producing long-term immunity
What will be an ideal response?
Passive immunization involves administering a patient the prepared antibodies from either a human or animal donor. The antibodies can be very effective in targeting an existing infection, but because the patient did not produce the antibodies using his or her own immune system, memory cells were not produced. Memory cells are essential to immunity because they respond to an antigen they have previously encountered, by mobilizing the specific defense to respond quickly with antibodies specific for that antigen.
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Which of the following is primarily responsible for the maternal effect?
A. Sperm cells B. Oocytes C. Nurse cells D. Placenta
At the molecular level, type A and type B blood differ in which of the following characteristics?
A. The antigens present on the surface of the red blood cells B. The type of sugar found in each type C. The antibodies that are generated against the other type of blood D. All of the answers are correct
Which statement is true?
a. The partial pressure of oxygen is greater in ambient air than in the blood. b. The partial pressure of oxygen is identical in arterial and venous blood. c. The partial pressure of CO2 is greater in ambient air than the blood. d. The partial pressure of CO2 is greater in arterial blood than venous blood.
During the third phase "3", the population
growth slows and then levels off because
a. essential resources become scarce. b. the carrying capacity has been reached. c. competition for food becomes increasingly important. d. predators eat fawns as they are born. e. all of these occur except "predators eat fawns as they are born."