TLS Online TPP Program

#Question id: 2635


In E. coli, deleting the ribosome binding site and region 1 of the trp attenuator and leaving the remainder of the attenuator intact has which of the following effects?

#I Life Science/ Life Sciences Group – I-V
  1. The attenuator structure will not form, and the structural genes will be transcribed.

  2. The attenuator structure will always form, and transcription will terminate.

  3. The frequency of attenuation will still be controlled by the concentration of trp-tRNAtrp.

  4. Translation of the structural genes will not occur.

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TLS Online TPP Program

#Question id: 11079

#SCPH28 | Zoology

The diffusing capacity of a gas is the volume of gas that will diffuse through a membrane each minute for a pressure difference of 1 mm Hg. Which of the following gases is often used to estimate the oxygen diffusing capacity of the lungs?

TLS Online TPP Program

#Question id: 11080

#I Life Science/ Life Sciences Group – I-V

The O2-CO2 diagram here shows a ventilation-perfusion ratio line for the normal lung. Which of the following best describes the effect of decreasing ventilation-perfusion ratio on the alveolar Po2 and Pco2?


TLS Online TPP Program

#Question id: 11080

#SCPH28 | Zoology

The O2-CO2 diagram here shows a ventilation-perfusion ratio line for the normal lung. Which of the following best describes the effect of decreasing ventilation-perfusion ratio on the alveolar Po2 and Pco2?


TLS Online TPP Program

#Question id: 11081

#I Life Science/ Life Sciences Group – I-V

In which of the following conditions is alveolar Po2 increased and alveolar Pco2 decreased?

TLS Online TPP Program

#Question id: 11081

#SCPH28 | Zoology

In which of the following conditions is alveolar Po2 increased and alveolar Pco2 decreased?

TLS Online TPP Program

#Question id: 11082

#I Life Science/ Life Sciences Group – I-V

A 67-year-old man has a solid tumor that pushes against an airway partially obstructing air flow to the distal alveoli. Which point on the ventilation-perfusion line of the O2-CO2 diagram corresponds to the alveolar gas of these distal alveoli?