Which of the following is not characteristic of the cytoskeleton?
a. the cytoskeleton supports the plasma membrane and is responsible for the particular shape, rigidity, and spatial geometry of each different cell type.
b. the cytoskeleton probably plays a role in regulating cell growth and division.
c. the cytoskeletal elements are all rigid, permanent structures.
d. the cytoskeleton is responsible for cell contraction and cell movements.
e. the cytoskeleton supports and organizes the ribosomes, mitochondria, and lysosomes.
C
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For several hundred years it was believed that _____ were poisonous.
a. watermelons b. grapes c. tomatoes d. poppy seeds
In addition to epidermal factors, pale skin can result from decreased ________ in the dermis.
What will be an ideal response?
A(n) ________ contraction describes the opening of stretch-activated channels in smooth muscle cells in response to a distortion of the cell membrane that is commonly observed in ________.
Fill in the blank(s) with the appropriate word(s).
Which of the four tissue membranes is relatively waterproof and usually dry?
A) synovial B) mucous C) serous D) cutaneous