Cancer is essentially
A) a never-ending repetition of the S phase of the cell cycle.
B) unregulated mitotic cell division.
C) the creation of extra checkpoints in the cell cycle.
D) the binding of cyclins and Cdks.
B
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Low levels of the neurotransmitter dopamine can lessen the ability to focus effectively on tasks. However, high levels of dopamine can result in feelings of motivation. How would you classify dopamine and why?
A) Dopamine is excitatory because it enhances motivation levels. B) Dopamine is inhibitory because it diminishes the ability to focus. C) Dopamine is both inhibitory and excitatory because it can enhance motivation levels but diminish the ability to focus.
When one conducts extrapolation, one is:
A. imputing values that have been mismeasured. B. drawing conclusions where there are "gaps" in the data. C. drawing conclusions beyond the extent of the data. D. correcting values that have been mismeasured.
Most radiolaria have an internal skeleton made of
A. glycoproteins. B. cellulose. C. siliceous material. D. microtubules.
One way N. gonorrhoeae became resistant to penicillin was by acquiring a plasmid that carries the penr penicillin resistance gene, which encodes a protein that
A) allows cells to synthesize penicillin. B) cleaves penicillin to an inactive form. C) pumps penicillin out of the cell. D) attaches penicillin to the cell wall.