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TLS Online TPP Program

#Question id: 9169

In areas of permafrost, stands of black spruce are frequently observed in the landscape, while other tree species are noticeably absent. Often these stands are referred to as "drunken forests" because many of the black spruce often "lean over" (that is, they are displaced from their normal vertical alignment). What is the most likely explanation for the unusual growth of these forests in this marginal habitat?


#Unit 9. Diversity of Life Forms
  1. Branches are adapted to absorb more carbon dioxide with this displaced alignment.
  2. Taproot formation is impossible, so trees developed shallow root beds
  3. Trees are tilted so snow prevents them from breaking or tipping over.
  4. Trees tip so that they do not compete with each other for sunlight.
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TLS Online TPP Program

#Question id: 12300

#Unit 7. System Physiology – Animal

Which of the following changes, compared with normal, would be expected to occur, under steady-state conditions, in a patient whose severe renal disease has reduced the number of functional nephrons to 25% of normal?
TLS Online TPP Program

#Question id: 12301

#Unit 7. System Physiology – Animal

Which of the following would likely lead to hyponatremia?
TLS Online TPP Program

#Question id: 11481

#Unit 7. System Physiology – Animal

Which of the following sensory receptors is correctly paired with its category?
TLS Online TPP Program

#Question id: 12955

#Unit 7. System Physiology – Animal

Which of the following would tend to decrease GFR by more than 10% in a normal kidney?
TLS Online TPP Program

#Question id: 12954

#Unit 7. System Physiology – Animal

A 55-year-old male patient with hypertension has had his blood pressure reasonably well controlled by administration of a thiazide diuretic. During his last visit (6 months ago) his blood pressure was 130/75 mm Hg and his serum creatinine was 1 mg/100 ml. He has been exercising regularly for the past 2 years, but recently has complained of knee pain and began taking large amounts of a nonsteroidal anti-inflammatory drug. When he arrives at your office, his blood pressure is 155/85 and his serum creatinine is now 2.5 mg/100 ml. Which of the following best explains his increased serum creatinine?
TLS Online TPP Program

#Question id: 12953

#Unit 7. System Physiology – Animal

 Which of the following diuretics inhibits Na+-2Cl−-K+ co-transport in the loop of Henle as its primary action?