1. What do we call the study of living things? a) chemistry b) biology c) physics d) natural science
2. What are the basic building blocks of matter? a) electrons b) molecules c) atoms d) cells
3. Two or more atoms held together by attractive forces a) molecule b) nucleus c) enzyme d) protein
5. These molecules : carbohydrates, proteins and ________ are essential for life? a) carbon monoxide b) acids c) lipids d) salt
6. What percentage of a human's body weight is water? a) less than 20% b) between 20 and 45 % c) between 55 and 60% d) more than 70 %
7. These speed up metabolism in the body : a) blood b) liver c) water d) enzymes
8. These are hormones - chemicals that coordinate different functions in our bodies: a) estrogen b) testosterone c) insulin d) all three
9. Lipids are ....... ? a) fats and oils b) oxygen and nitrogen c) teeth and bones d) flesh and blood