Which of the following is true of enzymes? Enzyme function is independent of physical and chemical environmental factors such as pH and temperature. Enzyme function is increased if the 3-D structure or conformation of an enzyme is altered. Nonprotein cofactors alter the substrate specificity of enzymes. Enzymes increase the rate of chemical reaction by lowering activation energy barriers. Enzymes increase the rate of chemical reaction by providing activation energy to the substrate.

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects

the supermassive black hole is in the middle of the galaxy.

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.