Cell membranes are said to be ________ because they allow some substances to pass but not others.
Fill in the blank(s) with the appropriate word(s).
selectively permeable
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Formation of membrane attack complex is associated with:
1.antibody production. 2.fever. 3.activation of complement system. 4.macrophage function.
Identical twins who __________ provide researchers with valuable information on the "nature-nurture question".
a. like the same things b. grow up in the same place c. were separated at birth d. have different math aptitudes
Cancer cells:
A) may exhibit metastasis.
B) have a slower mitotic rate than normal body cells.
C) are indistinguishable from normal body cells.
D) do not spread into other body tissues.
Bones are somewhat flexible due to ________
A) elastic fibers in the matrix B) soft, pliable ground substance of the matrix C) calcium salts in the ground substance D) collagen fibers in the matrix