A tube foot of a sea star moves when the small muscular bulb called the ____ contracts, forcing fluid
into the tube foot.
a. ampulla
b. ossicle
c. radial canal
d. ring canal
e. madreporite
A
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Estrogen is most likely to exert its effects by regulating
A. protein kinases. B. phopholipase C. C. expression of genes and production of specific proteins. D. cyclic AMP. E. Ca2+.
DNA repair in eukaryotes that facilitates replication in regions of thymine dimers is mediated by a unique DNA polymerase
A) ?. B) ?. C) ?. D) ?. E) ?.
The structures in this figure:a
provide anchorage points between adjacent cells.
b. allow the transport of small molecules and ions between adjacent cells.
c. allow passage of materials through intercellular spaces.
d. prevent the passage of materials through intercellular spaces.
e. can only be found in plants.c
In terms of relatedness to a specific cellular process, which protein does not belong with the others?
A. Ribonuclease B. RNA polymerase holoenzyme C. DNA polymerase holoenzyme D. DNA ligase