These white blood cells are in interstitial fluid,
phagocytize almost everything except
uninjured body cells, and secrete cytokine
which alerts the adaptive immune system to
threats. These white blood cells are
a. neutrophils.
b. macrophages.
c. T lymphocytes.
d. dendritic cells.
e. eosinophils
B
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Protein kinases ____
a. add phosphate groups to proteins b. bind cGMP c. stimulate adenylyl cyclase d. polymerize amino acids e. hydrolyze proteins
According to public health officials, all of the following may be caused by water pollutants EXCEPT which one?
A) birth defects B) nervous disorders C) miscarriages D) skin rashes E) autoimmune disorders
The black bellied seed cracker, Pyrenestes, is a West African finch. Within the same geographic region, two subspecies of the finch are found. One subspecies has a large beak, which is efficient at cracking the hard seeds of the sedge, Scleria verrucosa. The other subspecies has a small beak, which is more efficient at eating the soft seeds of the sedge, Scleria goossensii. What type of selection occurred to produce this situation? Explain what a population distribution graph would look like that would depict this type of selection.
What will be an ideal response?
A 20-foot-tall tree that seemed to have stopped growing was cut down by the forester who was concerned that it might be diseased. She had planted it 43 years earlier. Measurements over the past 10 years had shown that the tree's height varied only 2 or 3
inches each year, some years with a height increase and some years with a height decrease. Other data indicated that the tree had 41 rings of similar width and had produced similar numbers of nuts every year for the last 30 years. Based on these data, which conclusion was most likely a part of the forester's report on the tree's health? A) All growth in this tree stopped 10 years ago. B) This was a healthy tree that had reached its mature height but otherwise continued normal growth. C) Overactivity of the tree's apical meristems likely caused the stunted growth. D) The tree did not grow taller because it was putting all of its energy production into nut production.