Which of the following is NOT involved in nonspecific defenses?
A. natural killer cells
B. monocytes
C. neutrophils
D. mast cells
E. B cells
E. B cells
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Lizards and snakes are living members of this lineage
a. Testudines b. Archosauromorpha c. Squamata d. Sphenodontia e. Amphibia
Atrazine
a. is an herbicide that has been in use for more than 40 years. b. application in the United States totals about 76 million pounds annually. c. is used mostly to kill weeds in cornfields d. contamination of soils and water is common in the American Midwest. e. fits all of these descriptions.
The number of embryonic leaves, or ________, differentiates the two main classes of crop plants
A) cotyledons B) anthers C) carpels D) rhizomes
One difference between mitosis and meiosis I is that
a. homologous chromosome pairs synapse during mitosis. b. chromosomes do not replicate in the interphase preceding meiosis. c. homologous chromosome pairs synapse during meiosis but not during mitosis. d. spindles composed of microtubules are not required during meiosis. e. sister chromatids separate during meiosis but not during mitosis.