TLS Online TPP Program

#Question id: 809


A single-stranded DNA molecule contains 40 nucleotides with equal amounts of A, C, G, and T. This DNA strand can combine with a complementary DNA strand to form a double-stranded DNA molecule. Which of the following double-stranded DNA molecules would denature at a lower temperature than the 40 base-pair double-stranded molecule described above?

#SCPH05 I Biotechnology
  1. a 40 base-pair molecule in which 25% of the bases are adenines

  2. a 30 base-pair molecule in which 40% of the bases are guanines

  3. a 20 base-pair molecule in which 10% of the bases are thymines

  4. a 10 base-pair molecule in which 20 % of the bases are cytosines

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TLS Online TPP Program

#Question id: 11087

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

Which of the following oxygen-hemoglobin dissociation curves corresponds to normal blood (red line) and blood containing carbon monoxide (green line)?

TLS Online TPP Program

#Question id: 11088

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

At a fraternity party a 17-year-old male places a paper bag over his mouth and breathes in and out of the bag. As he continues to breathe into this bag, his rate of breathing continues to increase. Which of the following is responsible for the increased ventilation?

TLS Online TPP Program

#Question id: 11089

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

A 45-year-old man inhaled as much air as possible and then expired with a maximum effort until no more air could be expired. This produced the maximum expiratory flow-volume curve shown in the following diagram. What is the forced vital capacity of this man (in liters)?


TLS Online TPP Program

#Question id: 11090

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

An aviator is flying at 30,000 ft where the barometric pressure is 226 mm Hg. He is breathing 100% oxygen, his alveolar PCO2 is 40 mm Hg, and his alveolar water vapor pressure is 47 mm Hg. What is the alveolar PO2 of the aviator (in mm Hg)? (Assume that the respiratory quotient is equal to 1.)

TLS Online TPP Program

#Question id: 11091

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

A diver is breathing 10% O2 at a pressure of 2000 mm Hg. The diver’s body temperature is 37°C, and PCO2 = 32 mm Hg. What is the alveolar PO2?

TLS Online TPP Program

#Question id: 11092

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

Which statement is the most accurate definition of external respiration?