What is the function of proteins and carbohydrates that are embedded in a cell membrane? 1.they control what enters and leaves the cell. 2.they direct the reproduction process for the cell. 3.they act as storage molecules for water.

Answer : The correct answer is -

1.They help control what enters and leaves the cell.

Some molecules can not cross the lipid bilayer membrane (cell membrane) of cells (such as large polar molecules and hydrophilic molecules).

There are special carbohydrate and protein that are embedded in the membrane and act like Transmembrane channels or transporters, which assist in the trasport of such molecules (like amino acids and proteins) on both sides across the cell.

Thus, option 1) is the right answer.

c-reactive protein (crp) is an acute phase protein belonging to pentraxin family of proteins, whose levels increases 1000-fold or more in concentration in blood during the occurrence of an injury, inflammation or tissue death.

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.

hope this .. .