Molecules of Life Test

Name:

Which of the following statements about the Enzyme Lab is TRUE?

• pectinase is the enzyme and pectin is the substrate
• applesauce is the substrate and pectin is the enzyme
• applesauce is the enzyme and water is the active site
• water is the enzyme and pectinase is the substrate

Which of the following statements about fats is NOT true?

• saturated fats are solid at room temperature
• unsaturated fats come from plants
• unsaturated fats have all single bonds between carbon atoms
• saturated fats contain the maximum number of hydrogen atoms

Which of the following is NOT a function of proteins?

• defend the body from harmful microorganisms
• act as a main fuel for cells
• build structures such as muscle
• control chemical reactions in cells

Which of the following statements about carbohydrates is NOT true?

• glucose is a monosaccharide
• excess sugar is stored in the body in the form of glycogen
• cellulose is found in the cell walls of plants
• specialized carbohydrates that speed up chemical reactions are called enzymes

Which of the following statements about proteins is NOT true?

• proteins are monomers that link together to form enzymes
• proteins are composed of 20 different amino acids
• each protein has a specific shape that determines its function
• a chain of amino acids is called a polypeptide

A specific reactant an enzyme works upon is called the

• catalyst
• sucrase
• active site
• substrate

Which statement is true?

• Simple sugars are made of polysaccharides
• Glycerol is made of fatty acids
• Polymers are made of monomers
• Amino acids are made of proteins

Which of the following statements is NOT correct?

• the monomers of nucleic acids are phosphate groups
• proteins may be structural or functional
• carbohydrates contain carbon, hydrogen and oxygen
• waxes are lipids that help plants retain moisture

Enzymes affect the reactions in living cells by lowering the

• active site energy of the reaction
• speed of the reaction
• temperature of the reaction
• activation energy of the reaction