DNA from a bacterial strain with genotype his- leu- thr- is transformed with DNA from a strain that is his+ leu+ thr+. A few leu+ thr+ transformants and a few his+ thr+ transformatns are obtained, but no his+ leu+ cells are observed. Which of the following statement is not supported by these experimental observations? a. ‘his’ and ‘thr’ are closer than ‘his’ and ‘leu’
b. ‘leu’ and ‘thr’ are closer than ‘his’ and ‘leu’
c. ‘his’ and ‘thr’ are closer than ‘thr’ and ‘leu’
d. these results do not tell anything

answer; ///(statins)/aka as hmg coa

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

layer 3 is younger than layer 6.