IgE molecules involved in hypersensitivity reactions have become attached to
A. neutrophils.
B. mast cells.
C. B cells.
D. macrophages.
E. mast cells AND B cells.
B
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Thrush in a newborn's oral cavity becomes less frequent as the infant ages. What is the most likely reason for this?
A. The acquisition of normal microbiota prevents the overgrowth of yeast. B. The infant begins to produce antifungal antibodies. C. Vaccines given in early infancy prevent the development of thrush. D. The eruption of the teeth inhibits the growth of yeast.
________ were the first class of DNA sequence polymorphisms discovered in the human genome
A) SNPs B) Microsatellites C) VNTRs D) STRs E) RFLPs
Name at least two typical characteristics of a DNA cloning plasmid
What will be an ideal response?
Which of the following is the correct explanation for the data?
(A) At higher osmolarity, lower rates of contraction are required because more salt diffuses into the paramecia. (B) The contraction rate increases as the osmolarity decreases because the amount of water entering the paramecia by osmosis increases. (C) The contractile vacuole is less efficient in solutions of high osmolarity because of the reduced amount of ATP produced from cellular respiration. (D) In an isosmotic salt solution, there is no diffusion of water into or out of the paramecia, so the contraction rate is zero.