A fragment of DNA has 2400 nucleotides, of which 900A. Let's determine a. The length of that piece of DNA.
b. What is the number of nucleotides in each type of DNA?
c. Number of hydrogen bonds and covalent bonds in DNA fragment?
d. How many helices and molecular weight does that fragment of DNA have?

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

transformative rocks are the stones that emerge from the transformation of existing rock composes in a procedure called changeability, implies changing of structures. transformative rocks are shaped from alternate shakes that are changing a result of warmth or weight connected. one of this model is the earth developments that making rocks profoundly cover or crushed which will make the stones warmed and put under awesome weight. they are not softening but rather the minerals they are containing are changed synthetically that will shape transformative rocks. now and again different rocks are shaped when the others are near some liquid magma and getting warmed.