Which one of the following does not apply to plasma cells?
A. The are derived from B cells
B. They are effector B cells
C. They actively produce cytokines
D. They live for four to five days
E. They are large, highly complex cells
Answer: C. They actively produce cytokines
You might also like to view...
Increasing atmospheric carbon dioxide is
A) increasing sedimentation of C, Ca, and Si. B) increasing the effect of the biological pump. C) fueling increased primary production in ocean waters. D) acidifying the ocean and decreasing the rate of formation of calcareous shells.
Plants are dependent on microorganisms for
A. providing oxygen. B. providing water. C. changing atmospheric nitrogen to a usable form. D. providing carbohydrates.
Egg activation by sperm entry is associated with a sudden increase in protein synthesis. What must be true of these proteins?
A. They are histone proteins. B. They are small peptides. C. They are from maternal mRNAs. D. They are from paternal mRNAs.
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. Membranes with high amounts of cholesterol are very stable and have decreased permeability. B. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios. C. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios. D. Membranes with low amounts of cholesterol are very stable and have increased permeability.