Which of the following substances is an element?
A. Sodium chloride
B. Iron
C. Glucose
D. Water
Answer: B
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Without the positive selection process in lymphocyte maturation ________
A) NK cells would be non-functional B) monocytes would not be able to migrate into infected tissue and differentiate into macrophages C) T-cells would not be able to properly bind to APC's and therefore not be activated by them D) autoimmune diseases would be likely to result
The __________ law describes the logarithmic relationship between stimulus magnitude and perceived stimulus intensity
Fill in the blank with the correct word.
Which of the following is a principle of the fluid mosaic model of cell membrane structure?
A) Phospholipids form a bilayer that is largely impermeable to water-soluble molecules. B) Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains. C) The lipid bilayer is a solid at body temperature, thus protecting the cell. D) All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell.
Platelets are pinched off from giant multinucleated cells in the bone marrow called
A) erythroblasts. B) normoblasts. C) megakaryocytes. D) myeloblasts. E) lymphoblasts.