Use the complementary rule: If we had a DNA strand of 20 nucleotides, and 6 of them were adenine, how many thymine, guanine, and cytosine would we have?
6 thymine, 4 guanine, 4 cytosine
4 thymine, 6 guanine, 4 cytosine
O 6 thymine, 6 guanine, 6 cytosine
О 4 thymine, 4 guanine, 6 cytosine
Question 16
6 pts

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer? a. the chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced. b. the chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production c. free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone. d. chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone select the best answer from the choices provided

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.