DNA polymerase adds new nucleotides ONLY to the ________ end of a DNA strand.
A. 2?
B. 3?
C. 4?
D. 5?
Answer: B. 3?
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The activated sludge process
A. is used during secondary treatment of sewage. B. is meant to convert inorganic to organic matter. C. is meant to increase the BOD. D. removes large objects from the sewage. E. is meant to convert inorganic to organic matter AND is meant to increase the BOD.
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. telophase B. prior to metaphase C. anaphase D. cytokinesis
Why does a typical fish die quickly when it is removed from water?
A) Oxygen diffuses more rapidly in water than it does in air. B) The gills collapse and dry out in the air. C) Water contains more oxygen, per unit volume, than does air. D) Gills split water molecules into hydrogen and oxygen, which is used for cellular respiration.
In the biosphere, which of the following is NOT constantly recycled?
Select one: a. carbon b. nitrogen c. water d. energy e. phosphorus