Assuming geological evidence is accurate, life on Earth may have originated
a. 14 billion years ago.
b. 4.6 billion years ago.
c. 3.5 billion years ago.
d. 2.1 billion years ago.
e. 1.2 billion years ago.
C
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Antigen bearing particles in the blood travel to the ____, while those in solid tissues travel to the ____
a. spleen; bone marrow b. thymus; bone marrow c. spleen; lymph nodes d. lymph nodes; spleen e. bone marrow; thymus
Which structure in the accompanying figure is responsible for allowing entire regions of cells to respond to a single
stimulus?
a. A b. B c. C d. D e. E
Independent alignment creates genetic variation. This is associated with which stage of meiosis?
A. prophase I B. metaphase I C. anaphase II D. prophase II E. metaphase II
Which situation may result from genetically modifying foods?
A) rice that allows greater synthesis of vitamin A B) calorie-free potato chips C) a tomato that tastes like a melon D) lettuce that doesn't require water to grow