Worms have no skeletal system or muscular organ sytem.
a. true
b. false
Ans: a. true
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Mutations in bacterial porins can lead to antibiotic resistance typically by
A) closing the ?-helix of the porin. B) limiting the passage of nonpolar substances. C) blocking entry of the antibiotic. D) disrupting the voltage of the gated channel. E) all of the above
At rest, a cell has a ________ charge inside of the cell and a ________ charge outside of the cell.
Fill in the blank(s) with the appropriate word(s).
An operon:
A: is transcribed when RNA polymerase binds the operator. B: has several promoters, but all of the structural genes are related biochemically. C: is a cluster of functionally related genes that are transcribed all of the time at a constant rate. D: is regulated by a repressor protein binding to the promoter. E: is a cluster of structural genes that are all transcribed from the same promoter.
What anatomical part of polychaetes can be used for both locomotion and feeding?
A. Gills B. Bivalves C. Tentacles D. Trochophore E. Parapodia