Which immunoglobulin class/es can fix complement?
A. IgG only
B. IgE and IgA
C. IgD only
D. IgM and IgG
E. IgM only
Answer: D
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Cholesterol is a structural component of cell membranes. Amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane? A. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios. B. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios. C
Membranes with low amounts of cholesterol are very stable and have increased permeability. D. Membranes with high amounts of cholesterol are very stable and have decreased permeability.
Angiosperm tracheids move water more rapidly from roots to shoots than gymnosperm tracheids
Indicate whether the statement is true or false.
An example of an inorganic molecule is
A. C6H12O6. B. HCl. C. C4H8O4. D. C12H22O11.
Matt is studying how the protein transferrin enters cells. He examines cells that have taken up transferrin, and finds clathrin-coated vesicles. What mechanism was used to take transferrin into the cell?
A. phagocytosis B. pinocytosis C. receptor-mediator endocytosis D. exocytosis