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.
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
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.