생물학

Question 1

tracer

Answer 1

substances with certain properties that help identify, observe, or follow the behavior of processes

Question 2

pH

Answer 2

potential of hydrogen; measures the alkalinity or acidity of a substance

Question 3

steroids

Answer 3

lipids that have four fused rings, different from the general structure of other lipids

Question 4

functional groups

Answer 4

components of organic molecules that are most often involved in chemical reactions; they are attached to the carbon skeleton; they include amino, carboxyl, hydroxyl, and phosphate groups

Question 5

denaturation

Answer 5

proteins lose their characteristic shape due to adverse conditions that alter the weak intramolecular forces (such as conditions in the environment, pH, salt concentration, and temperature)

Question 6

theory of endosymbiosis

Answer 6

eukaryotic cells came into being when mitochondria and chloroplasts took up residence in larger cells about one and a half billion years ago