During muscle contractions,
a. the sarcomeres shorten.
b. the actin filaments slide over the myosin
filaments.
c. the actin filaments move toward the middle of
the sarcomere during contraction and away on
relaxation.
d. the muscle fibers thicken.
e. all of these occur.
Answer: e
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________ ER is covered by ribosomes and sends its modified proteins to the Golgi apparatus.
Fill in the blank(s) with the appropriate word(s).
The cell-cell interactions mediated by the selectins, integrins, and most members of the Ig superfamily are _______ interactions in which the cytoskeletons of adjacent cells are not linked to one another.
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A) the nucleus B) a DNA molecule C) a ribosome D) a tRNA molecule