24. True or false? a. Reactants have a higer free energy than products in an exe

Question

24. True or false? a. Reactants have a higer free energy than products in an exergonic reaction b. Enthalpy is energy stored within chemical bonds c. Entropy is disorder d. An enzyme is not used up in a reaction e. Induced fit model involves substrate binds to active site, conformation of enzyme is changed resulting in catalysis 25. The transmembrane domain of an integral membrane protein- a. b, c. d. is composed of hydrophobic amino acids often forms an helical structure can cross the membrane multiple times all of the above

Explanation / Answer

24)

a)True; Reactants have a higher free energy than products in an exergonic reaction. Exergonic reactions are spontaneous in nature with a negative G. A negative G means that the reactants, or initial state, have more free energy than the products, or final state.

b) False ; The heat absorbed or released from a system under constant pressure is known as enthalpy. It is not necessariliy stored in chemical bonds only, it is also a part of physical reactions.

c) True; In thermodynamics, entropy is commonly associated with the amount of order, disorder, or chaos in a thermodynamic system.

d) True ; An enzyme is not used up in reaction. Enzymes are catalysts that lower the activation energy for the reaction to occur but they themselves are not used up in reaction.

e) True; Induced fit model involves substrate binds to active site, conformation of enzyme is changed resulting in catalysis. The Induced fit model describes the formation of the E-S as a result of the interaction between the  substrate and a flexible active site.  The substrate produces changes in the conformation on the enzyme, aligning properly the groups in the enzyme. It allows better binding and catalytic effects.

25) Option d : All of the above is the correct answer.

The transmembrane domains of an integral membrane protein have amino acids with hydrophobic side chains that interact with fatty acyl groups of the membrane phospholipids, thus anchoring the protein to the membrane. Most integral proteins span the entire phospholipid bilayer. Integral membrane proteins often form an alpha-helical structure.

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.