Chronic inhalation of particular fungal allergens would lead to a(n)
A. type I hypersensitivity reaction.
B. type II hypersensitivity reaction.
C. type III hypersensitivity reaction.
D. type IV hypersensitivity reaction.
E. autoimmune disease.
Answer: C
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Some activated B cells are transformed into ________ cells that secrete antibodies, and others remain as ________ cells
A) plasma / memory B B) lymphocytes / memory B C) immunoglobulin / plasma D) immunoglobulin / TH
A key difference between single-gene traits such as those Mendel studied and complex traits such as human height is that:
A. complex traits are generally uninfluenced by the environment, whereas single-gene traits have a significant environmental component. B. single-gene traits are generally uninfluenced by the environment, whereas complex traits have a significant environmental component. C. complex traits show incomplete dominance, whereas single-gene traits show simple dominance. D. single-gene traits show both simple and incomplete dominance, whereas complex traits show only simple dominance. E. None of these choices describe differences between single-gene and complex traits.
Which statement about sperm entry is TRUE?
a. The fertilization cone formed by microvilli of the egg membrane contracts and draws the sperm inward. b. The egg phagocytizes the acrosome of the sperm so it can enter the cell.
c. The cilia on the egg membrane beat and sweep the sperm inside. d. The sperm releases calcium ions, which make the egg membrane permeable to its entry. e. The egg secretes bindin protein, which allows sperm penetration.
Rabbits can come in an allelic series where brown > himilayan > chinchilla > albino, where > means dominant over. They also can come in long (recessive) and short fur. You wish to obtain rabbit babies that are albino with long fur. Which of the
following crosses would you do? A) homozygous brown with long fur × albino with short fur (heterozygote) B) albino with long fur × homozygous himilayan with short fur (heterozygote) C) chinchilla heterozygous with albino with short fur (heterozygous) × brown heterozygous with albino with long fur D) albino with long fur × brown chinchilla heterozygote with long fur E) albino with long fur × albino with short fur (homozygous)