A number of tumors and viruses (e.g., Epstein-Barr) are able to escape cytotoxic T cell degradation by inhibiting what?
A) helper T cell activation
B) tumor antigen expression
C) the production of the class I MHC molecule
D) the production of the class II major histocompatibility (MHC) molecule
E) the activation of the complement system
Ans: C) the production of the class I MHC molecule
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The brain uses a lot of glucose. How does glucose pass through the blood-brain-barrier?
A. Glucose Channels B. Simple Diffusion C. Aquaporins D. Transporters
Asexual reproduction is indicated by letter
a. A. b. B. c. C. d. D. e. E.
Answer the following questions true (T) or false (F)
1. If an Rh-positive woman marries an Rh-negative man, their children are at risk for hemolytic disease of the newborn. 2. Infection with certain viruses may lead to the development of type I diabetes. 3. Depletion of the helper T cell population by HIV results in the development of AIDS.
You cut down a tree and count 23 annual rings in the trunk. You conclude that the tree is
A. probably 230 years old. B. most likely 23 years old. C. 46 years old. D. older than 46 years. E. This information does not tell the age of the tree.