B cells are activated when they interact with (antigen-presenting/Th1/Th2 ) cells
What will be an ideal response?
Th2
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Abdul, who is 6 years old and beginning his first day of school, comes into his classroom where some other children are eating peanuts. Within a few minutes he complains of dizziness and seems to be struggling to breathe. You suspect ________
A) chickenpox B) anaphylactic shock C) cancer D) Kaposi's sarcoma
The carbon dioxide that is exhaled when you breathe is produced during
A) cellular respiration. B) diffusion. C) intracellular digestion. D) glycolysis. E) nitrogen fixation.
In an attempt to determine the source of a growing plant's mass, van Helmont planted a willow seedling in a pot of soil. After 5 years, the willow weighed 76.8 kg, and the soil had lost 0.06 kg of weight. Only water had been added to the pot. Which
conclusion should van Helmont have drawn? A) Plants get their mass from water. B) Plants get their mass from water and air. C) Plants get their mass from water and atmospheric CO2. D) Plants get all or almost all of their mass from a source other than soil.
The part of the atom that is most involved in chemical reactivity is the
A. proton. B. neutron. C. electron. D. nucleus.