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| 1 | |
Which of the following is an example of potential energy? |
| | A) | A big piece of chocolate cake |
| | B) | Someone running a marathon |
| | C) | A fish swimming upstream |
| | D) | A leaf unfolding |
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| 2 | |
Which of the following statements about energy is FALSE? |
| | A) | Energy can't be created and it can't be destroyed. |
| | B) | Chemical energy in our food can be transformed into energy needed for muscle contractions. |
| | C) | When energy is transformed, all of it is available to do work. |
| | D) | A battery you just bought at the store has potential energy. |
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| 3 | |
Reactions which require an input of energy ___________. |
| | A) | are exergonic |
| | B) | are endergonic |
| | C) | will never occur |
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| 4 | |
In the reaction A + B --> C + D, the reactant(s) is/are ______________. |
| | A) | only A |
| | B) | A and B |
| | C) | only D |
| | D) | C + D |
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| 5 | |
Enzymes _____. |
| | A) | slow down chemical reactions |
| | B) | increase the energy of activation |
| | C) | bring together specific molecules and causes them to react with each other |
| | D) | All of these |
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| 6 | |
Cells that do a lot of active transport have many _____. |
| | A) | mitochondria |
| | B) | nuclei |
| | C) | chloroplasts |
| | D) | plasmids |
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| 7 | |
The coenzyme ____ accepts electrons during cellular respiration. |
| | A) | NAD+ |
| | B) | ATP |
| | C) | niacin |
| | D) | zinc |
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| 8 | |
During cellular respiration, glucose loses hydrogen ions so it is _____. |
| | A) | oxidized |
| | B) | reduced |
| | C) | phagocytized |
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| 9 | |
In the reaction (NADP+ + 2e- + H+ --> NADPH), NADP+ is _____. |
| | A) | oxidized |
| | B) | reduced |
| | C) | phosphorylated |
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| 10 | |
The speed of a reaction that involves an enzyme increases as ______. |
| | A) | optimal temperature decreases |
| | B) | pH becomes less than optimal |
| | C) | substrate concentration increases |
| | D) | All of these |
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| 11 | |
Denaturation _____. |
| | A) | changes the shape of the enzyme |
| | B) | prevents the enzyme from binding with its substrate molecules efficiently |
| | C) | occurs at temperatures above a certain point |
| | D) | All of the above |
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| 12 | |
A very high fever (105 degrees F) is dangerous because enzymes can become _________. |
| | A) | ionized |
| | B) | denatured |
| | C) | more structured |
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| 13 | |
Which of the following is an INCORRECT association of enzyme and substrate? |
| | A) | Maltose - maltase |
| | B) | Lipid - lipase |
| | C) | Sucrose - lactase |
| | D) | Acetylcholine - acetylcholinesterase |
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| 14 | |
The nitrogen base in ATP is _____________. |
| | A) | guanine |
| | B) | thymine |
| | C) | uracil |
| | D) | adenosine |
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| 15 | |
Energy is constantly supplied to ecosystems by _____. |
| | A) | radioactive elements |
| | B) | the Sun |
| | C) | heat from the ocean's thermal vents |
| | D) | gravity |
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| 16 | |
Which of the following is part of the first law of thermodynamics? |
| | A) | Some energy is lost when it is transferred. |
| | B) | The amount of energy in the universe is decreasing. |
| | C) | The amount of energy in the universe is constant. |
| | D) | The amount of energy in the universe is increasing. |
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| 17 | |
The sodium-potassium pump, associated with muscle and nerve cells, moves ______ to the outside of the cell and ______ to the inside of the cell. |
| | A) | K+, Na+ |
| | B) | Na+, Cl+ |
| | C) | Na+, K+ |
| | D) | none of these |
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| 18 | |
Without __________ organisms, life as we know it could not exist. |
| | A) | photosynthetic |
| | B) | carnivorous |
| | C) | herbivorous |
| | D) | parasitic |
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| 19 | |
Electron transport systems used to make ATP are located in the _____. |
| | A) | mitochondria |
| | B) | nucleus |
| | C) | Golgi bodies |
| | D) | vacuole |
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| 20 | |
ATP production in the electron transport system depends on _____. |
| | A) | the establishment of an electrochemical gradient |
| | B) | carrier proteins |
| | C) | ATP synthase |
| | D) | All of the above |
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