Practice Questions

TLS Online TPP Program

#Question id: 601

In a ping-pong reaction which does not occur?

#Unit 1. Molecules and their Interaction Relevant to Biology

One product is released before a second substrate is bound.
The enzyme covalently binds a portion of the first substrate.
The enzyme is permanently converted to an altered form by the first substrate.
A group is transferred from one substrate to another.

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TLS Online TPP Program

#Question id: 12304

#Unit 7. System Physiology – Animal

Which of the following changes would you expect to find after acute administration of a vasodilator drug that caused a 50% decrease in renal efferent arteriolar resistance and no change in afferent arteriolar resistance or arterial pressure?

TLS Online TPP Program

#Question id: 12305

#Unit 7. System Physiology – Animal

Which of the following would be expected to cause a decrease in extracellular fluid potassium concentration (hypokalemia) at least in part by stimulating potassium uptake into the cells?

TLS Online TPP Program

#Question id: 12306

#Unit 7. System Physiology – Animal

Which of the following is true of the tubular fluid that passes through the lumen of the early distal tubule in the region of the macula densa?

TLS Online TPP Program

#Question id: 12307

#Unit 7. System Physiology – Animal

If a person has a kidney transport maximum for glucose of 350 mg/min, a GFR of 100 ml/min, a plasma glucose of 150 mg/dL, a urine flow rate of 2 ml/min, and no detectable glucose in the urine, what would be the approximate rate of glucose reabsorption, assuming normal kidneys?

TLS Online TPP Program

#Question id: 12308

#Unit 7. System Physiology – Animal

Which of the following statements is correct?

TLS Online TPP Program

#Question id: 12379

#Unit 7. System Physiology – Animal

A healthy 29-year-old man runs a 10-km race on a hot day and becomes very dehydrated. Assuming that his antidiuretic hormone levels are very high, in which part of the renal tubule is the most water reabsorbed?