Astrand of dna in a skin cell contains the bases:
a-t-g-c-c-a-t-c-g-g-t-a
after the cell is exposed to ultraviolet light, the strand contains the bases:
a-t-g-g-c-c-a-t-c-g-g-t-a
which statement describes the result of this exposure?
(1)a new base has been inserted.
(2)a base has been deleted.
(3)one base has been substituted for another.
(4)there have been no changes in the bases.

Match with o for organic and i for inorganic for each compound

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled