Enzymes and Catalysts

At high temperatures enzyme activity declines because of:

• Denaturation
• Decreased Kinetic Motion
• Increased H-Bonding
• Dissociation of Ionic Compounds

Overheating an enzyme results in the enzyme’s loss of — 

• net electrical charge 
• storage of a large amount of chemical energy
• ability to catalyze a reaction 
• storage of inherited information

Which of the following biological molecules is correctly paired with one of the functions it primarily serves in living cells? 

• enzymes-are biological catalyst that speed up chemical reactions
• carbohydrates - component of cytoskeleton 
• lipids - catalyze chemical reactions 
• proteins - long term energy storage

In red blood cells, the compound carbonic anhydrase increases the rate at which carbon dioxide is converted to bicarbonate ions for transport in the blood.  In red blood cells, carbonic anhydrase acts as which of the following?

• an enzyme 
• a hormone 
• a lipid 
• a sugar

Which best describes how enzymes function in the body?

• Enzymes are converted into products by the reactions they catalyze.
• One enzyme can catalyze many different reactions. 
• An enzyme is used once and then destroyed by the cell.
• Enzymes lower the activation energy of reactions.

Which statement describes the major role of enzymes within a cell?

• They cause DNA to replicate.
• They catalyze chemical reactions in the cell.
• They move RNA in the cytoplasm
• They are molecules made of amino acids that speed up chemical reactions by lowering the activation energy.

Most cellular activities are processes regulated by the action of —

• carbohydrates
• enzymes
• lipids
• polysaccharides

Tags

NGSS.HS-LS1-7

Which of the following is correctly paired? 

•   Carbohydrates and DNA
• Lipids and DNA
• Proteins and Enzymes
• Lipids and RNA

Tags

NGSS.HS-LS1-1

Enzymes are proteins that help increase the rate of chemical reactions inside cells. Which of the following suggests that the shape of an enzyme determines the enzyme’s function?

• Enzymes are specific to a substrate.
• Enzymes can operate in a wide range of conditions.
• Enzymes are activated by neighboring molecules.
• Enzymes can be found in all life-forms.

Which best describes the role of enzymes in a chemical reaction?

• absorb excess energy 
• increase the reaction rate 
• release unused energy 
• regulate product reactivity