Which statement is true?
a. Symptoms of Alzheimer’s disease are distinct from symptoms of normal aging.
b. Many neurological disorders are treatable but have no known cure.
c. Most neurological disorders can be reversed by changes in diet.
d. Parkinson’s disease results in extreme shrinkage of the cerebral cortex.
b. Many neurological disorders are treatable but have no known cure.
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Which factor is the most important algal contribution to the fungal component of a lichen?
a. improved water conservation b. mechanical protection from being blown away c. photosynthetically derived food d. less overlap among individual algal cells e. pigment for camouflage
A circulatory system that allows some mixing of
oxygenated and oxygen-poor blood is indicated by a. A. b. B. c. C. d. A and B. e. all of these.
Which statement about a secondary immune response is FALSE?
a. It is a response to an antigen. b. It may occur years after a primary response. c. It involves memory cells. d. It has a longer latent period than a primary response. e. It is stimulated by less antigen than in a primary response.
The sex chromosome composition of a person with Turner's syndrome is
A) XXX B) XXY C) XO D) XYY