1. The six elements that make up 99.9% of all living things include 1.C, K, O, N, Ca and S 2.C, P, S, H, O and N 3.C, P, K, I, O and N 4.N, O, P, H, S and T

2. Which chemical elements would you expect to find in abundance in a living cell? 1.hydrogen, neon, argon 2.carbon, oxygen, hydrogen 3.iron, magnesium, calcium 4.sodium, potassium, sulfur

3. What are the building blocks of protein molecules? 1. Polymers 2.fatty acids 3.glucose molecules 4.amino acids

4. Fats are important energy storage compounds because they: 1. readily breakdown to form glucose 2. provide immediate energy 3.contain more energy per gram than carbohydrates or proteins 4.are liquid at normal body temperatures 5.don't require nitrogen

5. Which of the following describes the function of proteins? 1.energy formation and storage 2.energy used in muscles and reaction 3.structural use and enzyme formation 4.heredity and genetic code carriers

6. What is the most common food storage compound in plants? 1.Glucose 2.Starch 3.Sucrose 4.Cellulose 5.fat

7. The properties of water make it very valuable to living systems. Which of the following statements regarding water is not true? 1.it modifies temperature extremes 2.it makes up about 50% of your body 3.it is the greatest solvent in the world 4.it expands slightly when it freezes 5.it covers more than 75% of the earth's surface

8. Which of the following statements are true of enzymes? 1.they are lipids 2.they will react with most body chemicals 3.they can only be used once 4.they usually slow down reactions and prevent overheating of the cells 5.they usually speed up chemical reactions

9. Which characteristic of water allows it to support the weight of objects more dense than water? 1.capillary action 2.surface tension 3.specific heat 4.Evaporation 5.adhesion

10. Water is polar in nature. To be polar means to: 1.be very cold and difficult to warm up. 2.freeze easily and boil rapidly 3.have positive and negative charged ends 4.have a low heat capacity

11. Which one of the following is not an organic molecule found in living organisms? 1.Protein 2.Nucleic acid 3.Carbohydrate 4.Sodium chloride 5.Lipid

12. Which combination of particle and charge is correct? 1.Proton:positively charged 2.Electron:positively charged 3.Neutron: negatively charged 4.Proton: negatively charged

13. Which of the following molecules is made up of glycerol and fatty acids? 1.Sugars 2.Starches 3.Lipids 4.Nucleic acids 5.proteins

14. An acidic solution could have a pH of 1.7 2.10 3.3 4.14

15. The three particles in an atom are 1.Protrons, neutrons, ions 2.Protons, neutrons, electrons 3.Proteins, lipids, carbohydrates 4.Isotopes, electrons, neutrons

16. Which of the following is a positive test for starch? 1.Benedicts solution turns orange 2.Iodine turns yellow 3.Iodine turns black 4.Biuret turns violet

17. Which of the following is a positive test for a simple sugar? 1.Sudan IV powder dissolves coloring the solution red 2.Biuret turns blue 3.Iodine turns black 4.Benedicts turns red

18. When salt is dissolved in water, the water is the 1.Reactant 2.Solution 3.Solute 4.Solvent

19. A substance with a pH of 8 is 1.An acid 2.A base 3.Both an acid and a base 4.neutral

20. How much more acidic is a substance with a pH of 4 compared to a substance with a pH of 6? 1.10 times 2.20 times 3.100 times 4.1000 times

21. Which of the following is an example of a catalyst? 1.An enzyme 2.Sodium Chloride 3.Water 4.Carbon Dioxide