Which of the following cell types initiates a secondary immune response?
A) natural killer cells
B) memory cells
C) effector cells
D) plasma cells
B
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Larval oysters attach themselves to:
a. They do not have specific requirements. b. any available solid substrate. c. other oyster shells. d. both b and c e. sand.
Which one of the following is TRUE regarding the "recycling" of hemoglobin?
A) The peptide chains are broken down into their constituent fatty acids. B) The iron atoms are returned to the red bone marrow. C) The heme groups are converted to urine by the kidneys. D) The peptide chains are transported intact to the bone marrow for reuse. E) The heme groups with their iron atoms are transported to the spleen.
In biology, fitness is defined as _____.
A. the ability of an individual to detect life-threatening situations B. the ability of an individual to successfully capture prey C. the ability of an individual to produce surviving offspring D. the ability of an individual to perform physical feats of strength
In general, the blastomeres of the _____ form the endodermal tissues.
A. membrane B. equator region C. vegetal pole D. animal pole