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

Biology & Microbiology

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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.

Biology & Microbiology

Angiosperm tracheids move water more rapidly from roots to shoots than gymnosperm tracheids

Indicate whether the statement is true or false.

Biology & Microbiology

An example of an inorganic molecule is 

A. C6H12O6. B. HCl. C. C4H8O4. D. C12H22O11.  

Biology & Microbiology

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

Biology & Microbiology