The non-leukocyte tissue cells known as ________ activate enzymes which produce leukotrienes and prostaglandins in response to allergen binding.
A. neutrophils
B. basophils
C. monocytes
D. lymphocytes
E. mast cells
Answer: E
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Variegated four o'clock leaves have white patches among the green areas due to
A) the presence of cells in which most of the mitochondria have a mutation that blocks electron transport. B) the presence of cells in which most of the chloroplasts have a mutation that prevents synthesis of chlorophyll. C) an incompletely penetrant mutation in a nuclear gene that prevents production of chlorophyll. D) a recessive mutation in a nuclear gene that results in a defect in ribosomes.
An intermediate level of disinfection kills mycobacteria, most viruses, and most bacteria, but not spores.
a. true b. false
The approximate diameter of an actin filament is
a. 8-12 nm. b. 7 nm. c. 25 nm. d. 5 mm.
In a population, the most common phenotype represents the dominant allele
Indicate whether the statement is true or false