TLS Online TPP Program

#Question id: 4511


The proteins are not needed for the splicing reaction itself, because

#Unit 3. Fundamental Processes
  1. In vivo, the intron is complexed with several proteins that help stabilize the correct structure-partly by shielding regions of the backbone from each other.

  2. The negative charges provided by the phosphates in those backbone regions would repel each other if shielded.

  3. In vitro, high salt concentrations (and thus positive ions) compensate for the absence of these proteins.

  4. Only a and d

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TLS Online TPP Program

#Question id: 444

#Unit 1. Structure and Function of Biomolecules

Which of the following is not a factor contributing to the large free energy of hydrolysis of ATP?

TLS Online TPP Program

#Question id: 445

#Unit 1. Structure and Function of Biomolecules

In order for a reaction to proceed spontaneously from left to right as written

TLS Online TPP Program

#Question id: 446

#Unit 1. Structure and Function of Biomolecules

Which statement is false about ATP?

TLS Online TPP Program

#Question id: 447

#Unit 1. Structure and Function of Biomolecules

In glycolysis, fructose 1,6-bisphosphate is converted to two products with a standard free-energy change (DG'°) of 23.8 kJ/mol.  Under what conditions encountered in a normal cell will the free-energy change (DG) be negative, enabling the reaction to proceed spontaneously to the right?

TLS Online TPP Program

#Question id: 448

#Unit 1. Structure and Function of Biomolecules

During glycolysis, glucose 1-phosphate is converted to fructose 6-phosphate in two successive reactions: Glucose 1-phosphate -> glucose 6-phosphate DG'° = –7.1 kJ/mol Glucose 6-phosphate -> fructose 6-phosphate DG'° = +1.7 kJ/mol DG'° for the overall reaction is:

TLS Online TPP Program

#Question id: 449

#Unit 1. Structure and Function of Biomolecules

The standard free-energy changes for the reactions below are given. Phosphocreatine -> creatine + Pi DG'° = –43.0 kJ/mol ATP ->  ADP + Pi DG'° = –30.5 kJ/mol What is the overall DG'° for the following reaction? Phosphocreatine + ADP -> creatine + ATP