Practice Questions

TLS Online TPP Program

#Question id: 3989

Which one of the following statements about the transcription attenuation mechanism is true?

#Unit 3. Fundamental Processes

In some operons (e.g., the his operon), attenuation may be the only regulatory mechanism.
Sequences of the trp operon leader RNA resemble an operator.
The leader peptide acts by a mechanism that is similar to that of a repressor protein.
The leader peptide gene of the trp operon includes no Trp codons.

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TLS Online TPP Program

#Question id: 12700

#Unit 7. System Physiology – Animal

A young man is found comatose, having taking an unknown number of sleeping pills an unknown time before. An arterial blood sample yields the following values: pH = 7.02, HCO3− = 14 mEq/L, and PCO2 = 68 mm Hg. This patient’s acid–base status is most accurately described as

TLS Online TPP Program

#Question id: 12701

#Unit 7. System Physiology – Animal

In chronic respiratory acidosis with partial renal compensation, you would expect to find the following changes, compared to normal:___ urinary excretion of NH4+; ______ plasma HCO3− concentration; and _____ urine pH.

TLS Online TPP Program

#Question id: 12949

#Unit 7. System Physiology – Animal

At which renal tubular sites would the concentration of creatinine be expected to be highest in a normally hydrated person?

TLS Online TPP Program

#Question id: 12950

#Unit 7. System Physiology – Animal

Increases in both renal blood flow and GFR are caused by which of the following?

TLS Online TPP Program

#Question id: 12951

#Unit 7. System Physiology – Animal

If the cortical collecting tubule tubular fluid inulin concentration is 40 mg/100 ml and plasma concentration of inulin is 2.0 mg/100 ml, what is the approximate percentage of the filtered water that remains in the tubule at that point?

TLS Online TPP Program

#Question id: 12952

#Unit 7. System Physiology – Animal

Which of the following changes would tend to increase Ca2+ reabsorption in the renal tubule?