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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 | |
Which of the following is true about NAD+? |
| | A) | NAD+ is a coenzyme. |
| | B) | NAD+ transfers electrons from one reaction site to another. |
| | C) | NAD+ is a nonprotein organic molecule. |
| | D) | All of the above are true. |
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5 | |
The site on the enzyme surface where the reactant is stressed is the |
| | A) | binding site. |
| | B) | the active site. |
| | C) | allosteric site. |
| | D) | ATP site |
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6 | |
The activity of an enzyme can be affected by |
| | A) | coenzymes. |
| | B) | temperature. |
| | C) | pH. |
| | D) | all of the above |
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7 | |
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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8 | |
A molecule of ATP contains |
| | A) | fructose. |
| | B) | glucose. |
| | C) | three potassium molecules. |
| | D) | ribose. |
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9 | |
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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10 | |
What useful product is formed after six turns of the Calvin cycle? |
| | A) | ATPB |
| | B) | NADPH |
| | C) | glucose |
| | D) | AMP |
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11 | |
During chemiosmosis, the energy that converts a molecule of ADP to ATP comes from |
| | A) | a proton escaping the thylakoid vesicle. |
| | B) | a proton entering the thylakoid vesicle. |
| | C) | AMPD. |
| | D) | NADPH. |
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12 | |
The energy needed to attach hydrogen atoms to carbon to form carbon-chain molecules comes from |
| | A) | ATP. |
| | B) | DNA. |
| | C) | NADPH. |
| | D) | NAD. |
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13 | |
Which one of the following is not associated with C4 photosynthesis? |
| | A) | oxaloacetate |
| | B) | warmer climates |
| | C) | mesophyll |
| | D) | phosphoglycerate |
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14 | |
The stage of cellular respiration that does not require oxygen is |
| | A) | the Calvin cycle. |
| | B) | the Krebs cycle. |
| | C) | photorespiration. |
| | D) | glycolysis. |
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15 | |
The total number of ATP produced from the breakdown of a glucose molecule by glycolysis and oxidation is |
| | A) | 2. |
| | B) | 18. |
| | C) | 34. |
| | D) | 36. |
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16 | |
Plants need light to use ATP to synthesize plant molecules from CO2 in the air. |
| | A) | true |
| | B) | false |
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17 | |
In leaves, chlorophyll a and chlorophyll b are the only pigments capable of capturing energy from light. |
| | A) | true |
| | B) | false |
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18 | |
"Oxygen debt" occurs when plants produce oxygen during photosynthesis faster than it can be released from the plant. |
| | A) | true |
| | B) | false |
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19 | |
During fermentation, yeast adds extracted electrons to acetaldehyde to form ethanol. |
| | A) | true |
| | B) | false |
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20 | |
Activation energy is only required to start endergonic reactions. |
| | A) | true |
| | B) | false |
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21 | |
In chemical reactions, the molecules that are present at the beginning are called the reactants. |
| | A) | true |
| | B) | false |
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22 | |
The carbon atoms from a completely oxidized glucose molecule become part of carbon dioxide. |
| | A) | true |
| | B) | false |
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23 | |
The stripping of electrons from food molecules is oxidation. |
| | A) | true |
| | B) | false |
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24 | |
About 25% of the radiant energy from the sun that reaches the earth each day is captured by photosynthesis. |
| | A) | true |
| | B) | false |
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25 | |
Plants use chlorophyll to absorb primarily the green band of the visible spectrum. |
| | A) | true |
| | B) | false |
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