A student is proposing a model to compare prokaryotic cells and eukaryotic cells. The student is using string to model the cell membrane, beans to represent the ribosomes, and pipe cleaners to model the chromosomes. How will the student need to revise the model to demonstrate a prokaryotic cell rather than a eukaryotic cell ?

A) The student will need to use beans in both models, but will use no pipe cleaners in the prokaryotic model. The same amount of string will be used in both models.
B) The student will use more beans in the prokaryotic model, but the same amount of string in both. The student will need to use fewer pipe cleaners in the prokaryotic model.
C) The student will need to use no beans in the prokaryotic cell model. The student will need circular pipe cleaners in both models. The student will use more string in the prokaryotic model to make the cell bigger.
D) The student will use less string for the membrane of the prokaryotic cell because the cell is smaller. The student will need to include beans in both models. The student will need to circularlize the pipe cleaners for prokaryotic DNA.

D-)

The student will use less string for the membrane of the prokaryotic cell because the cell is smaller. The student will need to include beans in both models. The student will need to circularize the pipe cleaners for prokaryotic DNA.

Explanation:

The student will use less string for the membrane of the prokaryotic cell because the cell is smaller. The student will need to include beans in both models. The student will need to circularize the pipe cleaners for prokaryotic DNA. Prokaryotic cells have circular DNA, smaller cell size, and ribosomes (all cells have these). The model will need to be modified to make sure the two cell types can be compared.

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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