TLS Online TPP Program

#Question id: 11544


When a steroid hormone and a polypeptide hormone exert similar effects on a population of target cells, then ________.

#Unit 7. System Physiology – Animal
  1. the steroid and polypeptide hormones must use the same biochemical mechanisms
  2. the steroid and polypeptide hormones must bind to the same receptor protein
  3. the steroid hormones affect the synthesis of effector proteins, whereas polypeptide hormones activate effector proteins already present in the cell
  4. the steroid hormones affect the activity of certain proteins within the cell, whereas polypeptide hormones directly affect the processing of mRNA

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TLS Online TPP Program

#Question id: 31365

#Unit 1. Structure and Function of Biomolecules

To purify ‘A’ from a mixture of these four proteins in a single step, using ion-exchange chromatography, what combination of buffer pH and ion-exchange resin would you select?


TLS Online TPP Program

#Question id: 402

#Unit 1. Structure and Function of Biomolecules

If the DG'° of the reaction A -> B is –40 kJ/mol, under standard conditions the reaction:

TLS Online TPP Program

#Question id: 403

#Unit 1. Structure and Function of Biomolecules

For the reaction A -> B, DG'° = –60 kJ/mol.  The reaction is started with 10 mmol of A; no B is initially present.  After 24 hours, analysis reveals the presence of 2 mmol of B, 8 mmol of A. Which is the most likely explanation?

TLS Online TPP Program

#Question id: 404

#Unit 1. Structure and Function of Biomolecules

When a mixture of 3-phosphoglycerate and 2-phosphoglycerate is incubated at 25 °C with phosphoglycerate mutase until equilibrium is reached, the final mixture contains six times as much 2-phosphoglycerate as 3-phosphoglycerate.  Which one of the following statements is most nearly correct, when applied to the reaction as written?  (R = 8.315 J/mol·K; T = 298 K)  3-Phosphoglycerate -> 2-phosphoglycerate

TLS Online TPP Program

#Question id: 405

#Unit 1. Structure and Function of Biomolecules

When a mixture of glucose 6-phosphate and fructose 6-phosphate is incubated with the enzyme phosphohexose isomerase (which catalyzes the interconversion of these two compounds) until equilibrium is reached, the final mixture contains twice as much glucose 6-phosphate as fructose 6-phosphate.  Which one of the following statements is best applied to this reaction outlined below? (R = 8.315 J/mol·K; T = 298 K) Glucose 6-phosphate -> fructose 6-phosphate

TLS Online TPP Program

#Question id: 406

#Unit 1. Structure and Function of Biomolecules

Hydrolysis of 1 M glucose 6-phosphate catalyzed by glucose 6-phosphatase is 99% complete at equilibrium (i.e., only 1% of the substrate remains). Which of the following statements is most nearly correct? (R = 8.315 J/mol·K; T = 298 K)