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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: 12075

#Unit 7. System Physiology – Animal

A 48-year-old woman complains of severe polyuria (producing about 0.5 L of urine each hour) and polydipsia (drinking two to three glasses of water every hour). Her urine contains no glucose, and she is placed on overnight water restriction for further evaluation. The next morning, she is weak and confused, her sodium concentration is 160 mEq/L, and her urine osmolarity is 80 mOsm/L. Which of the following is the most likely diagnosis?
TLS Online TPP Program

#Question id: 12076

#Unit 7. System Physiology – Animal

Furosemide (Lasix) is a diuretic that also produces natriuresis. Which of the following is an undesirable side effect of furosemide due to its site of action on the renal tubule?
TLS Online TPP Program

#Question id: 12077

#Unit 7. System Physiology – Animal

 RU486 causes abortion if it is administered before or soon after implantation. What is the specific effect of RU486?
TLS Online TPP Program

#Question id: 12078

#Unit 7. System Physiology – Animal

Following ejaculation, arterial blood flow into the corpora cavernosa decreases back to the normal resting level resulting in the flaccid state. What is the best explanation for this decrease in blood flow?
TLS Online TPP Program

#Question id: 12079

#Unit 7. System Physiology – Animal

Which of the following decreases the rate of urinary excretion of calcium ions by the kidney?
TLS Online TPP Program

#Question id: 12080

#Unit 7. System Physiology – Animal

A 55-year-old man has developed the syndrome of inappropriate antidiuretic hormone secretion due to carcinoma of the lung. Which of the following physiological responses would be expected?