1.Whih of the following is not an organic moleule?
Water
2.Which of the following terms includes all the other terms on this list?
Carbohydrate
3.Which term is most appropriate to describe a moleculte that dissolves eaily in water?Hydrophilic
4.Cholesterol is an example of what kind of moleculte?
Lipid
5.The 20 amino acids vary only in their
aminogroups
6.A specific reactant an enzyme ats upon is called the
substrate
7.An enzyme does whih of the following
Lowers the ativation energy of a reaction
8.Besides satisfying your hunger, why else might you consume a big bowl of pasta the night before a race?
You would onsume the pasta since the carbohydrages help you get energy for the race.
9.How are glucose, sucrose, and starch related?
They are all carbohydrates.
10. What are steroids? Describe two functions they have in cells.
Steroids are lipids that have a ring shaped carbon skeleton. They also help your body by sending signals and this also choses weather you are a men or a women.
11.How are Polypeptides related to proteins?
Polypeptides make up proteins.
12.How does denaturation affect the ability of a protein to function?
Denaturation affects proteins because it causes the protein to unravel and lose its function and abilities.
14. Analyzing Diagrams.
a. One product of this reaction is represented by a question mark. Which molecule is it?
The molecule that is also produced is a water molecule.
b.What is this kind of reaction called? Explain.
Dehydration reaction, because when the two amino acids combine they need to bond so they give away a water molecule together which dehydrating.
c.If an amino acid were added to this chain, at what two places could it attach?
The possible places would be defintely consisting of a Hydrogen + Oxygen atoms or just a Hydrogen atom.
15.Analyzing Graphs
a.At which temperature does enzyme A perform best? Enzyme B?
Enzyme A performs the best when the temperature is at 35 Celcius and Enzyme B works best at 75 degree celsius
b. Knowing that one of these enzymes is found in humans and the other in thermophilic bacteria, hypothesize which enzyme came from which organism.
Enzyme A is from humans, and Enzyme B is from the weird bacteria.
Monday, September 8, 2008
Sunday, September 7, 2008
5.5
Enzymes are proteins that speed up specific reactions in cells.
Enzymes and Activation Energy
-To start a chemical reaction, first need to weaken the chemical bonds
-molecules to absorb energy.
activation energy- start up energy
one way - heat up the mixture of molecule *then activation energy is produced*
Hot molecule colide with cooler molecule weakens the bond.
cellular reactions depend on the assistance of catalysts
catalysts-compounds that speed up chemical reactions.
enzymes-the main catalysts of chemical reaction in organisms are specialized proteins
enzymes provied a way for reactions to occur at the cell's normal temp.
enzyme do not supply activation energy to the reacting molecule, but lowers the energy requirement barrier so that the reaction can proceed at normal cell temp.
How Enzyme Work
A substrate binds to an enzyme at an active site. The enzyme-substance interaction lowers the activation energy required for the reaction to proceed. In this example, water is added to the weakened bond in sucrose, breaking sucrose into glucose and fructose.
CONCEPT CHECK:
1. Explain the role of activation energy in a reaction. How does an enzyme affect activation energy?
Activation energy in a reaction starts up the required molecules to get energy which is to trigger a chemical reaction and activate the reactants which allows a chemical reaction to happen. An enzyme affects activation energy because it helps to speed up cellular reactions and provides a way for reactions to occur at cell's normal temperature.
2. Describe how a substrate interacts with an enzyme.
A substrate interacts with an enzyme by helping this specific reactant fit into a particular region, the active site. When it fits in the active site, the active site changed slightly, fitting the substrate better.
Enzymes and Activation Energy
-To start a chemical reaction, first need to weaken the chemical bonds
-molecules to absorb energy.
activation energy- start up energy
one way - heat up the mixture of molecule *then activation energy is produced*
Hot molecule colide with cooler molecule weakens the bond.
cellular reactions depend on the assistance of catalysts
catalysts-compounds that speed up chemical reactions.
enzymes-the main catalysts of chemical reaction in organisms are specialized proteins
enzymes provied a way for reactions to occur at the cell's normal temp.
enzyme do not supply activation energy to the reacting molecule, but lowers the energy requirement barrier so that the reaction can proceed at normal cell temp.
How Enzyme Work
A substrate binds to an enzyme at an active site. The enzyme-substance interaction lowers the activation energy required for the reaction to proceed. In this example, water is added to the weakened bond in sucrose, breaking sucrose into glucose and fructose.
CONCEPT CHECK:
1. Explain the role of activation energy in a reaction. How does an enzyme affect activation energy?
Activation energy in a reaction starts up the required molecules to get energy which is to trigger a chemical reaction and activate the reactants which allows a chemical reaction to happen. An enzyme affects activation energy because it helps to speed up cellular reactions and provides a way for reactions to occur at cell's normal temperature.
2. Describe how a substrate interacts with an enzyme.
A substrate interacts with an enzyme by helping this specific reactant fit into a particular region, the active site. When it fits in the active site, the active site changed slightly, fitting the substrate better.
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