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TLS Online TPP Program

#Question id: 12537

In terms of nutrient cycling, why does timber harvesting in a temperate forest cause less ecological devastation than timber harvesting in tropical rain forests?

#Unit 10. Ecological Principles
  1. Trees are generally smaller in temperate forests, so fewer nutrients will be removed from the temperate forest ecosystem during a harvest.
  2. Temperate forest tree species require fewer nutrients to survive than their tropical counterpart species, so a  harvest removes fewer nutrients from the temperate ecosystem.
  3. The warmer temperatures in the tropics influence rain forest species to assimilate nutrients more slowly, so tropical reforestation is much slower than temperate reforestation.
  4. Typical harvests remove up to 75% of the nutrients in the woody trunks of tropical rain forest trees, leav- ing nutrient-impoverished soils behind.
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TLS Online TPP Program

#Question id: 12207

#Unit 7. System Physiology – Animal

Which of the following hormones activate enzyme-linked receptors?
TLS Online TPP Program

#Question id: 12208

#Unit 7. System Physiology – Animal

Which of the following is produced by the trophoblast cells during the first 3 weeks of pregnancy?
TLS Online TPP Program

#Question id: 12209

#Unit 7. System Physiology – Animal

At birth, a large, well-nourished baby is found to have a plasma glucose concentration of 17 mg/Dl (normal is 80 to 100 mg/dL) and a plasma insulin concentration twice the normal value. What is the explanation for these findings?
TLS Online TPP Program

#Question id: 12210

#Unit 7. System Physiology – Animal

Which of the following stimulates the secretion of parathyroid hormone (PTH)?
TLS Online TPP Program

#Question id: 12211

#Unit 7. System Physiology – Animal

A 57-year-old man is admitted as an emergency for upper GI bleeding. Endoscopy reveals multiple ulcers in the duodenum. Serum gastrin levels are eight-fold higher compared to normal. Zollinger-Ellison syndrome (ZES, gastrinoma) is suspected. Administration of which of the following substances is useful in confirming the diagnosis?
TLS Online TPP Program

#Question id: 12212

#Unit 7. System Physiology – Animal

 A 71-year-old man with upper abdominal pain and blood in the stool takes NSAIDS for the pain and washes it down with whiskey. Pentagastrin administration produced lower than predicted levels of gastric acid secretion. Secretion of which of the following substances is most likely to be diminished in this patient with gastritis?