Which immune cells are long-lived cells that can respond to a later encounter with the same antigen?
a. helper T cells
b. plasma cells
c. dendritic cells
d. memory cells
e. cytotoxic T cells
ANSWER: d
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Where does karyogamy occur in ascomycetes?
a. basidia b. conidiophores c. sporangia d. asci e. zygospores
If you eliminated all sources of calcium (dairy products, some vegetables) from your diet, the level of which of the following would rise in an attempt to supply calcium stored in your body to the tissues that need it?
a. aldosterone b. calcitonin c. mineralocorticoids d. parathyroid hormone e. thyroid hormone
A beaker is divided into two halves, A & B, by a membrane that is freely permeable to the water and NaCl but not to protein. Side A is half-filled with a solution of 8% protein, while side B is half filled with a 2% protein solution. Predict what would happen to side A after a few hours.
A. The number of protein molecules has increased. B. The number of water molecules has decreased. C. The number of water molecules has increased. D. The percentage of water has decreased.
Shigella species have the following characteristics except
A. not motile B. release endotoxin C. belong to Enterobacteriaceae D. infect the small intestine E. produce enterotoxin