Which event represents the process of releasing chemical mediators?
A. Binding of IgE by the Fc region to mast cells and basophils
B. Binding of allergen to adjacent IgE binding sites on mast cells and basophils
C. Histamine acting on smooth muscle
D. Degranulation
E. Prostaglandins causing vasodilation and increased vascular permeability
Answer: D
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The selective permeability of a cell membrane is due to ____
a. the hydrophobic core formed by the phospholipid tails b. the hydrophilic end facing the cell exterior c. glycolipids on the surface of the membrane d. the position of cholesterol in the membrane bilayer e. the hydrophilic core formed by the phospholipid tails
Which of the following statements is incorrect regarding the characteristics of fungi?
A. Fungi have cellulose as the main component of their cell walls. B. Fungi carry out photosynthesis. C. Fungi obtain nutrients through organic matter. D. Glycogen is the main storage carbohydrate in fungi. E. All of the answer choices are correct.
An increase in the rate of carbon dioxide production by tissue will ____
a. increase the rate of H+ production b. cause the blood to become less acidic c. cause hemoglobin to retain oxygen d. cause hemoglobin to release carbon dioxide e. have no effect on oxygen delivery to tissue
In blastulas, if cells from an area that would normally become skin are transplanted into an area that would become the nervous system, the transplanted cells will form structures of the nervous system
Indicate whether the statement is true or false