You were out in the garage going through boxes when you were bitten by an a spider. You tell the doctor that the spider was tiny and black, causing the doctor to think perhaps that it was a black widow spider The doctor gives you an injection of antibody to the spider venom to give you immediate protection. The antibody is produced in horses by injecting them with small doses of the spider venom, causing the horse's immune system to make large amounts of specific antibody to the antigen. The horse serum is then purified before being given to humans.A week later, you notice a red rash spreading away from the injection spot, where the doctor gave you the anti-venom shot. A few days later, the rash has spread and swelling in also present. You have joint pain as well as sore
muscles all over your body. The lymph nodes in the armpit are swollen and painful. Going back to the doctor, he diagnoses you with
A. a Staphylococcus infection related to the spider bite.
B. serum sickness.
C. Arthus reaction.
D. a delayed type hypersensitivity mediated by cytotoxic T cells along with helper T cells.
E. anaphylactic shock.
Answer: B
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Each of the following molecules move across membranes by simple diffusion except
A) oxygen. B) fatty acids. C) water. D) glucose. E) carbon dioxide.
A plant breeder is attempting to breed a variety of corn with high oil content. Each generation, he crosses only those plants that have the highest oil content. Over time, the average oil content of his plants increases. He does this with two strains of plants. For Strain A, h2 = 0.3. For Strain B, h2 = 0.6. Which strain will more quickly increase in oil content with selection?
a. Strain A b. Strain B c. Strain C d. No difference
Which wavelengths are absorbed by the ozone layer high in the atmosphere?
a. visible wavelengths of electromagnetic radiation b. longer wavelengths of electromagnetic radiation c. any wavelength of electromagnetic radiation d. shorter wavelengths of electromagnetic radiation