What type of cell is activated in lymphatic tissue by macrophages presenting antigens during a viral infection?
What will be an ideal response?
Helper T (TH) cell
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Which of the following statements reflects the first law of thermodynamics?
A. The energy of the starting materials for a reaction will equal the sum of energies of the products plus energy released as heat and disorder. B. The amount of useable energy resulting from a reaction will always be less than the total energy available in the starting materials. C. The entropy of the products of a reaction will always be greater than the entropy of the starting materials. D. The entropy of the starting materials for a reaction will always be greater than the entropy of the products.
Which of the following does NOT correctly describe antidiuretic hormone?
A. It regulates water turnover in the mammalian kidney. B. ADH secretion is stimulated by high blood osmolarity. C. It ultimately acts to reabsorb more water. D. It exerts it effects via the cAMP pathway. E. It does not involve the use of aquaporin molecules.
The nitrogen cycle on land begins with ____
a. nitrification b. denitrification c. decomposition d. uptake by producers e. nitrogen fixation
The giant squid axon has been used extensively in research to determine the mechanisms by which neurons generate electrical signals. Scientists used microelectrodes to measure the resting membrane potential (inside relative to outside) and discovered a difference of
A. ?300 mV. B. 0 mV. C. ?70 mV. D. 70 mV. E. 300 mV.