Long term energy storage? Your answer choices are: – Carbohydrates – Lipids – Proteins – Nucleic Acids
What type of energy is stored in food? Light Chemical Electrical Thermal
Starch is classified as a A.Disaccharide B.Monosaccharide C.Nucleotide D.Polysaccharide
Lactose is classified as a A.Disaccharide B.Monosaccharide C.Nucleotide D.Polysaccharide
Sucrose is classified as a A.Disaccharide B.Monosaccharide C.Nucleotide D.Polysaccharide
Glucose is classified as a A.Disaccharide B.Monosaccharide C.Nucleotide D.Polysaccharide
Fats that are stored in human tissue contain molecules of A.Glycerol and fatty acids B.Amino acids C.Monosaccharides and disaccharides D.nucleotides
Is the reaction below a synthesis or decomposition reaction? Catalase 2H 2 O 2 --------------------> 2H 2 + 2O 2 Decomposition because the hydrogen peroxide is being broken down into hydrogen and oxygen gas.
What are the enzyme and substrate in the reaction below? Catalase 2H 2 O 2 --------------------> 2H 2 + 2O 2 Enzyme = Catalase Substrate = 2H 2 O 2
Why is catalase written on the arrow? Catalase 2H 2 O 2 --------------------> 2H 2 + 2O 2 Because it is not used up in the reaction. It can be used over and over again.
Which are the reactants? Products? Catalase 2H 2 O 2 --------------------> 2H 2 + 2O 2 Hydrogen peroxide – reactant Hydrogen and oxygen molecules - products
Salivary amylase is an enzyme in our saliva. It only digests… Starch
What is the function of an enzyme? Speed up or catalyze chemical reactions
Which of the following is characteristic of an enzyme? A.It is a carbohydrate B.It is destroyed after each chemical reaction C.It provides energy for any chemical reaction D.It increases the rate of a specific chemical reaction
Which metabolic process is responsible for digesting food molecules? A.Dehydration synthesis B.Hydrolysis C.Photosynthesis D.Active transport
The “lock and key” model of enzyme action illustrates that a particular enzyme molecule will… A.Form a permanent enzyme-substrate complex B.Be destroyed and reassembled C.Interact with a specific type of substrate molecule D.React at identical rates under all conditions
The part of the enzyme molecule into which the substrate fits is called the A.Active site B.Coenzyme C.Polypeptide D.lactase
Which graph best illustrates the effect of temperature on enzyme activity?
T/F Each enzyme can catalyze (speed up) many different types of reactions. – FALSE – Enzymes are specific and each enzyme only works on ONE reaction.
T/F An enzyme can only be used once. – FALSE – Enzymes can be used over and over again until they wear out or denature (change shape because of heat)
What are the reactant(s)? What are the product(s)?
Is this reaction dehydration synthesis or hydrolysis?
Polymers of polysaccharides, fats, and proteins are all joined together from monomers by which process? a.connecting monosaccharides together (condensation reactions) b.the addition of water to each monomer (hydrolysis) c.the removal of water (dehydration reactions) d.ionic bonding of the monomers e.the formation of hydrogen bonds between monomers
Which of the following best summarizes the relationship between dehydration synthesis reactions and hydrolysis? A.Dehydration synthesis reactions assemble polymers, and hydrolysis breaks down polymers. B.Dehydration synthesis reactions can occur only after hydrolysis. C.Hydrolysis creates monomers, and dehydration synthesis reactions break down polymers. D.A and C are correct.
Identify each of the rxns as endothermic or exothermic. ABAB A – endothermic B - exothermic
In an endothermic reaction energy is _________. In an exothermic reaction energy is _________. – First blank – stored – Second blank - released
What happens to enzyme activity as the substrate concentration increases? The enzyme activity increases until all of the enzymes are saturated. At this point all the enzymes are in use and the reaction cannot go any faster.
Draw a “general” line to represent an enzyme that functions best in an acidic environment.