During acquired immunity, which of the following cells secretes antibodies?
a) eosinophil
b) mast cells
c) plasma cells
d) B-cells
Answer: c) plasma cells
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Which of the following produces new cells that are genetically identical to the original cell?
A. meiosis B. mitosis C. crossing over D. independent assortment E. fertilization
Which of the following is not an invasive species?
A) cheatgrass B) purple loosestrife C) ring-necked duck D) Asian longhorned beetle
A new DNA strand elongates only in the to direction because _____
A) DNA polymerase begins adding nucleotides at the end of the template B) the polarity of the DNA molecule prevents addition of nucleotides at the end C) replication must progress toward the replication fork D) DNA polymerase can add nucleotides only to the free end
Which is the proper sequence of classification categories, moving from the largest to the smallest group of organisms?
A. kingdom, phylum, class, order, family, species, genus B. kingdom, phylum, family, class, order, genus C. kingdom, phylum, class, order, family, genus species D. kingdom, phylum, division, class, order, family, genus