QUESTION 10 If a short sequence of DNA reads TAACGTCCAGGCAAA, what is the complementary sequence in the other strand of DNA? (just type the letters of the nucleotides)

ATTGCAGGTCCGTTT

Explanation:

A always goes with T

C always goes with G

(I remember this because the letters C and G look like each other)

So, if you have the strand: ATGCA

The complementary strand will look like this: TACGT

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 .. .

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products