The drug Taxol, or Paclitaxel, is used to treat patients with a variety of cancers, including breast, lung and ovarian cancers. The drug works by stabilizing microtubules, and preventing their disassembly. The goal of the drug is to prevent dividing cells from being able to complete mitosis. As a result, cancerous cells can no longer divide. In a cell treated with Taxol, at what stage of mitosis will the cells arrest?
A. Prior to metaphase
B. Telophase
C. Anaphase
D. Cytokinesis
Answer: A
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Why do histone genes have the slowest molecular clock?
A. The structure of the histone gene must be conserved for DNA to function properly. B. Histone genes simply do not have the same rate of mutations. C. DNA-correcting mechanisms function more readily with histone genes. D. Cells have more histone genes than any other kind of gene. E. Histone genes normally have selfcorrecting mechanisms.
Parasitic helminths have a highly developed ________ system to enhance host transmission.
A. nervous B. reproductive C. respiratory D. digestive E. muscular
The dominant producers of the infralittoral fringe in temperate Pacific and Atlantic are the:
a. foliose red algae. b. green algae. c. large brown algae. d. eelgrass. e. calcareous red algae.
The dark middle layer of the eye that prevents the scattering of light within the eyeball is the ____.
A. fovea B. retina C. sclera D. choroid E. cornea