University:
Kentucky State University
Course:
BIO 408 | Cell Biology
Academic year:

2019
Views:

107

Pages:

13
Author:

Lamghari6kx

Chapter 6 (Energy & Life) Which of the following states the relevance of the first law of thermodynamics to biology? Concept6.1) SHOW HINT Living organisms must increase the entropy of their surroundings. Photosynthetic organisms produce energy in sugars from sunlight Because living things consume energy, the total energy of the universe is constantly decreasing. Energy is destroyed as glucose is broken down during cellular respiration Energy can be freely transformed among different forms as long as the total energy is conserved Correct. The first law of thermodynamics states that energy can be transformed but can be neither created nor destroyed. 2) Which part of the equation AGAH-TAS tells you if a process is spontaneous? ConceRL5.2) SHOW HINT AS AG 1) AH TAS All of these values reveal the direction in which a reaction will go. Correct, In any spontaneous process, the free energy of a system decreases. The change in free energy equals the change in total energy minus the change in entropy times the temperature. 3) If, during a process, the system becomes more ordered, then Concept 6.2) SHOW HINT AS is negative AH is negative AG is positive ΔΗ is positive AG is negative Correct. In an endergonic reaction, in which order is increased, the change in entropy, symbolized by AS, is negative. 4) When one molecule is broken down into six component molecules, which of the following will always be true? Concept 6.2) SHOW HINT An input of free energy is needed. AG is positive. AH is negative. AS is negative. AS is positive. Correct. The large increase in disorder associated with this reaction means that entropy (AS) increases. 22) The process of stabilizing the structure of an enzyme in its active form by the binding of a molecule outside the active site is an example of Concept 6.5) SHOW HINT cooperativity allosteric activation competitive inhibition noncompetitive inhibition feedback inhibition Correct. The molecule in this example would be termed an allosteric activator. 23) Which of the following statements about allosteric proteins is/are true? ( Concept 6.5) SHOW HINT They exist in active and inactive conformations. They are sensitive to environmental conditions. They are acted on by inhibitors. All of the first three listed responses are correct. None of the first three listed responses is correct. 24) Which of these statements about enzyme inhibitors is true? ( Concept 6.4) SHOW HINT A competitive inhibitor binds to the enzyme at a place that is separate from the active site. Inhibition of enzyme function by compounds that are not substrates is something that only occurs under controlled conditions in the laboratory. A noncompetitive inhibitor does not change the shape of the active site. The action of competitive inhibitors may be reversible or irreversible. When the product of an enzyme or an enzyme sequence acts as its inhibitor, this is known as positive feedback. Correct. Competitive inhibitors that bind covalently to the enzyme would be irreversible, and those that bind weakly would be reversible.

Chapter 6 Energy and Life

of 13

Description

Free up your schedule!

Take 5 seconds to unlock