5 Written Questions
5 Matching Questions
- In the electron transport systems of chloroplasts and mitrochondria,
A. the system consists of a series of membrane bound carriers that transfer electrons from one carrier to another.
B. high energy electrons enter the system and low energy electrons exit the system.
C. energy release occurs when the electron transfers from one carrier to another.
D. All of the choices are correct.
- An automobile engine is about 20 - 30% efficient in converting chemical energy to mechanical energy. Cells are about 39% efficient if the transformation of glucose to ATP. The rest of the energy is lost as heat. This is illustrative of the:
A. First Law of Thermodynamics.
B. Second Law of Thermodynamics.
C. Third Law of Thermodynamics.
D. The Cell Theory.
- ATP is considered to be
A. an enzyme used widely in all kinds of cells.
B. a coenzyme used to inhibit or activate different enzymes.
C. a molecule that carries a great deal of chemical energy in a chemical bond.
D. the precursor of a high-energy membrane-bounded protein.
__________ represents the first reactant of this metabolic pathway and ________ reperesents the endproduct (s) of the pathway?
A. A; E
B. B; E and F
C. A; E and F
D. A and B; D and E
- Which form of energy is NOT correctly associated with the related example?
A. kinetic energy: fat molecules
B. kinetic energy: movement of muscles
C. chemical energy: glucose
D. potential energy: water held behind a dam
E. potential energy: ATP
- a A. kinetic energy: fat molecules
- b C. a molecule that carries a great deal of chemical energy in a chemical bond.
- c D. All of the choices are correct.
- d C. A; E and F
- e B. Second Law of Thermodynamics.
5 Multiple Choice Questions
- B. Mitochondria and chloroplasts.
- D. An enzyme's activity is generally reduced by an increase in substrate concentration.
- C. Hydrogen ions are pumped across the membrane by carrier proteins of the electron transport chain.
- E. Both taking lactase enzyme and avoiding all dairy products would be correct.
5 True/False Questions
Which of the following is consistent with the laws of physics governing energy?
A. When a liter of gasoline is burned in a car engine, 100% of its energy goes into moving the car along the road.
B. You eat a "quarter-pounder" hamburger and assemble exactly a quarter-pound of additional body weight on your body.
C. Eventually sunlight that is absorbed on the earth returns to space as dispersed heat.
D. A calorie of sunlight becomes a calorie of plant tissue that, eaten by you, becomes a calorie of heat lost in muscle "power."
E. Chemical bonds are a case of converting energy to matter; breaking the bonds converts matter to energy. → C. a muscle contracting
The subunits from which ATP is made are:
A. ADP and phosphate.
B. FAD and NAD+.
C. FAD and NADPH.
D. ADP and FAD.
E. ADP and NAD+. → A. ADP and phosphate.
A coenzyme is
A. an ionic cofactor that interacts with an enzyme to allow it to work.
B. a protein cofactor that interacts with an enzyme to allow it to work.
C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.
D. an ionic cofactor that interacts with an enzyme to inhibit it.
E. a protein cofactor that interacts with an enzyme to inhibit it. → C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.
If there are twelve different intermediate products produced in the stages for production of a molecule in a cell, we can expect that there
A. is one enzyme that carries this process through to the end product.
B. is one enzyme for degradation and another enzyme for synthesis.
C. may not be any enzymes involved if this is a natural cell product.
D. must be twelve different raw materials combined in the cell by one enzyme.
E. are about twelve enzymes, at least one responsible for each step in the metabolic pathway. → E. are about twelve enzymes, at least one responsible for each step in the metabolic pathway.
Which of the following labels is incorrectly identified.
A. A refers to the products.
B. B refers to the substrate-enzyme complex.
C. C refers to the reactants.
D. D refers to the product. → D. oxidized; reduced