Which type of wound is caused by the scraping away of skin.

The steps, or rungs, of the DNA ladder-like structure consist of complementary chemicals that are

a. acetic acids. b. fatty acids. c. pairs of nitrogenous bases. d. sugar–phosphate compounds.

Sometimes when DNA is duplicated, errors called ________ occur that will be passed on to the descendants (daughter cells) of that cell and may or may not affect the cells in harmful ways.

Fill in the blank(s) with the appropriate word(s).