Choose the one answer that best answers the question.
 |
1 | |
Enzymes accelerate reactions by ___ the activation energy needed for the reaction. |
| | A) | stopping |
| | B) | raising |
| | C) | lowering |
| | D) | binding |
|
|
2 | |
The values for environmental factors at which an enzyme functions best is called the. |
| | A) | paradigm of maximum effectiveness |
| | B) | optimal conditions |
| | C) | comfortable conditions |
| | D) | efficient conditions |
|
|
3 | |
During the procedure using the potato extract demonstrating the affect of temperature, what was the enzyme studied? |
| | A) | catalase |
| | B) | catechol |
| | C) | catechol oxidase |
| | D) | benzoquinone |
|
|
4 | |
During the procedure using the meat extract demonstrating the affect of pH, what was the substrate of the reaction? |
| | A) | catalase |
| | B) | catechol |
| | C) | catechol oxidase |
| | D) | hydrogen peroxide |
|
|
5 | |
What happens to an enzyme when it denatures? |
| | A) | The activation energy of the reaction is doubled. |
| | B) | The activation energy of the reaction is lowered. |
| | C) | It's optimal conditions for temperature of the enzyme are doubled. |
| | D) | The shape of the enzyme molecule is changed. |
|
|
6 | |
During the procedure using the turnip extract demonstrating the affect of inhibitors, what was the enzyme studied? |
| | A) | peroxidase |
| | B) | catalase |
| | C) | catechol oxidase |
| | D) | hydrogen peroxide |
|
|
7 | |
Exactly how would an extremely low pH (less than 2.0) denature an enzyme? |
| | A) | The extra energy would cause violent movement and collisions until the bonds in the molecule broke, causing the shape to change. |
| | B) | The high concentration of hydrogen ions (H+) would break the bonds in the molecule, causing the shape to change. |
| | C) | The high concentration of hydroxide ions (OH-) would break the bonds in the molecule, causing the shape to change. |
| | D) | Because pH molecules are structurally similar to the substrate molecules, they inhibit the chemical reaction. |
|
|
8 | |
Exactly how do inhibitors affect the reaction rate of enzymes? |
| | A) | The extra energy would cause violent movement and collisions until the bonds in the molecule broke, causing the shape to change. |
| | B) | The high concentration of hydrogen ions (H+) would break the bonds in the molecule, causing the shape to change. |
| | C) | The high concentration of hydroxide ions (OH-) would break the bonds in the molecule, causing the shape to change. |
| | D) | Because the inhibitor molecules are structurally similar to the substrate molecules, they slow down the chemical reaction. |
|
|
9 | |
For some of the procedures a spectrophotometer was used at an exact wavelength. Why was this wavelength used as opposed to any others? |
| | A) | It was the wavelength of the highest absorbance. |
| | B) | It was the wavelength of lowest absorbance. |
| | C) | It was the lowest wavelength setting for the spectrophotometer. |
| | D) | It was the wavelength at which the enzyme would react with the substrate. |
|
|
10 | |
Most enzymes are composed of... |
| | A) | lipids |
| | B) | carbohydrates |
| | C) | proteins |
| | D) | phosphates |
|
2002 McGraw-Hill Higher Education