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| 1 | |
A chemical reaction that releases energy is called |
| | A) | exergonic. |
| | B) | endergonic. |
| | C) | catalysis. |
| | D) | substrate. |
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| 2 | |
Which of the following is not true about an enzyme? |
| | A) | It is a carbohydrate. |
| | B) | It is a catalyst. |
| | C) | Its shape determines its specificity. |
| | D) | It lowers the activation energy required. |
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| 3 | |
Allosteric enzymes need a signal molecule to bind to them in order to |
| | A) | repress the chemical reaction controlled by the enzyme. |
| | B) | activate the chemical reaction controlled by the enzyme. |
| | C) | change the shape of the enzyme. |
| | D) | All of the above can be correct. |
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| 4 | |
The site on the enzyme surface where the reactant fits is the |
| | A) | binding site. |
| | B) | active site. |
| | C) | allosteric site. |
| | D) | ATP site. |
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| 5 | |
The activity of an enzyme can be affected by |
| | A) | coenzymes. |
| | B) | temperature. |
| | C) | pH. |
| | D) | All of the above |
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| 6 | |
Which one of the following lists the molecules in order, going from most energy to least energy? |
| | A) | AMP, ADP, ATP |
| | B) | ADP, AMP, ATP |
| | C) | ATP, ADP, AMP |
| | D) | ATP, AMP, ADP |
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| 7 | |
A molecule of ATP contains |
| | A) | fructose. |
| | B) | glucose. |
| | C) | three potassium molecules. |
| | D) | ribose. |
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| 8 | |
Energy is released from ATP when it |
| | A) | gains a phosphate group. |
| | B) | loses a phosphate group. |
| | C) | splits its sugar component. |
| | D) | gains a nucleotide. |
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| 9 | |
Activation energy is only required to start endergonic reactions. |
| | A) | True |
| | B) | False |
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| 10 | |
In chemical reactions, the molecules that are present at the beginning are called the reactants. |
| | A) | True |
| | B) | False |
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| 11 | |
The Second Law of Thermodynamics concerns the amount of energy in the universe. |
| | A) | True |
| | B) | False |
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| 12 | |
The universe is constantly becoming more disordered. |
| | A) | True |
| | B) | False |
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| 13 | |
The three parts of an ATP molecule are a ribose sugar, an adenine molecule, and three phosphate groups. |
| | A) | True |
| | B) | False |
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| 14 | |
Most human enzymes work best with the range of pH 6 to 8. |
| | A) | True |
| | B) | False |
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| 15 | |
The site on the reactant that binds to an enzyme is called the |
| | A) | binding site. |
| | B) | active site. |
| | C) | specific site. |
| | D) | reactive site. |
| | E) | activation area. |
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| 16 | |
Oxidation and reduction reactions always take place together. |
| | A) | True |
| | B) | False |
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| 17 | |
The energy required to initiate a chemical reaction is called |
| | A) | activation energy. |
| | B) | initiation energy. |
| | C) | catalysis. |
| | D) | primary energy. |
| | E) | initial energy. |
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| 18 | |
Even when catalysts are available, which of the following is also required for a reaction to occur? |
| | A) | Favorable atmospheric conditions |
| | B) | Oxygen |
| | C) | Energy |
| | D) | Zinc |
| | E) | Hydrogen |
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| 19 | |
Energy exists in which of the following forms? |
| | A) | Mechanical |
| | B) | Electric current |
| | C) | Heat |
| | D) | Light |
| | E) | All of the above |
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| 20 | |
Temperature above the optimum denatures most enzymes. |
| | A) | True |
| | B) | False |
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