1. Which of the following organic molecules can never be used as a source of energy? a. Carbohydrates b. Lipids c. proteins d. nucleic acids Nucleic acids.

1. Which of the following organic molecules can never be used as a source of energy?

a. Carbohydratesb. Lipidsc. proteinsd. nucleic acidsNucleic acids

d. Nucleic acids

2. Match the following organic molecules to the appropriate structures.CarbohydrateLipidProtein

Lipid Protein

Carb

3. Which statement is correct regarding acids and bases?

A. Acids increase the pH and bases decrease the pH.

B. Acids release hydrogen (H+) ions [or hydronium (H3O+) ions] and bases release hydroxide (OH-) ions.

C. Acids are harmful but bases are not harmful.

D. Acids combine with bases to form sugars.

B. Acids release hydrogen (H+) ions [or hydronium (H3O+) ions] and bases release hydroxide (OH-) ions.

4. Which of the following is NOT a main component of living cells?

a. Aluminumb. Hydrogenc. Carbond. Nitrogen

a. Aluminum

5. Which word association is NOT correct?

a. Nucleic acid – DNAb. Carbohydrate – steroidc. Lipid – long-term energy storaged. Protein – enzyme

b. Carbohydrate – steroid

6. Proteins are a major part of every living cell and have many different functions within each cell. Carbohydrates also perform numerous roles in living things.

Part 1. Describe how the structures of proteins differ from the structures of carbohydrates.

Part II. Describe how the functions of proteins and carbohydrates differ.

Part 1. Describe how the structures of proteins differ from the structures of carbohydrates.Proteins are made from repeating subunits called amino acids (which contain nitrogen), which are connected together by peptide bonds. Carbohydrates are generally ringed or long chained structures that always has a general formula of CH2O.

Part II. Describe how the functions of proteins and carbohydrates differ.Carbohydrates generally are used as an energy source for living organisms. Proteins are the structural material of the body. They make up muscles and bones. They also serve as chemical receptors and enzymes in living things

8. In the picture below, is one of many water molecules that would be found in a beaker of water. ***Hand-draw picture*** Part I. Draw 3 additional water molecules surrounding the one given. Each molecule drawn must be properly oriented to the molecule given. Part II. Draw a box around 1 possible hydrogen bond in the above diagram. Part III. Draw a box around a covalent bond in the above diagram. Part IV. Label the partial charges on both hydrogens and the oxygen on one molecule.

9. Match the monomer to the appropriate polymer. Write the letter of the monomers beside the corresponding polymer.

A. Amino acidB. MonosaccharideC. Fatty acid & glycerolD. Nucleotide

Lipid ___Carbohydrate ___Nucleic acids ___Proteins ___

A. Amino acidB. MonosaccharideC. Fatty acid & glycerolD. Nucleotide

Lipid ___CCarbohydrate ___BNucleic acids ___DProteins ___A

10. Compounds are formed when

a. atoms of an element lose an electron.

b. atoms of an element gain an electron.

c. atoms of the same element join together.

d. atoms of two different elements join together.

d. atoms of two different elements join together.

11. What allows you to fill a glass of water above the rim without the water spilling over the edge?

a. Cohesion of water molecules.

b. Breaking of the ionic bonding of water.

c. Balance between H+ and OH- ions.

d. The vibrational movements of water molecules.

a. Cohesion of water molecules.