Which of the following statements about type I reactions is FALSE?
A) They involve helper T cells.
B) They involve IgE antibodies.
C) The symptoms are due to histamine.
D) Antibodies bind to mast cells and basophils.
E) The symptoms occur soon after exposure to an antigen.
A
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Alchemists were medieval scholars and philosophers who were the forerunners of modern-day chemists. Many tried repeatedly to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never did succeed in that endeavor
What will be an ideal response?
Huffaker's experiment involving oranges showed
A) predators will always consume prey to extinction. B) prey will always outlast predators. C) with enough complexity, predator and prey populations will oscillate. D) both species use oranges for refuge.
The figure below shows a cell in the mitotic stage of ________.
a. anaphase. b. prophase. c. interphase. d. telophase. e. metaphase.
Which of the following microbes can oxidize ferrous iron while using chlorate or perchlorate as the electron acceptor?
A. Ferribacterium limneticum B. Pseudomonas denitrificans C. Thiobacillus ferrooxidans D. Dechlorosoma suillum