You are now studying a 13 kD protein that we will all p13. Assume your protein acts exclusively as a monomer and does not bind DNA, chromatin or any other large structures in the nucleus. You find that your protein is located exclusively in the cytoplasm and does not appear to be in the nucleus. Which of the following must be true of your protein? a. It contains neither an NES or an NLS.
b. It contains an NES.
c. It contains an NLS.
d. It contains both and NES and an NLS.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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