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TLS Online TPP Program

#Question id: 3294

Which one of these processes describes bottleneck effect?

#Unit 9. Evolution & Diversity of Life Forms

  1. Chance events that change allele frequency

  2. alleles transferred to the next generation in portions that differ from previous generation

  3. transfer of alleles in and out of a population due to movement of fertile individuals

  4. sudden change in environments that alters gene frequency of a populationa

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TLS Online TPP Program

#Question id: 12217

#Unit 7. System Physiology – Animal

Cystic fibrosis is the most common cause of pancreatitis in children. Which of the following best explains the mechanism of cystic fibrosis–induced pancreatitis?
TLS Online TPP Program

#Question id: 12218

#Unit 7. System Physiology – Animal

The control of gastric acid secretion in response to a meal involves several events that take place over a 4- or 5-hr period following the meal. These events include
(1) a decrease in the pH of the gastric contents,
(2) an increase in the rate of acid secretion,
(3) a decrease in the rate of acid secretion, and
(4) an increase in the pH of the gastric contents. Which of the following best describes
the correct temporal order of events over a 4- or 5-hr period following a meal?
TLS Online TPP Program

#Question id: 12219

#Unit 7. System Physiology – Animal

When the dietary intake of K+ increases, body K+ balance is maintained by an increase in K+ excretion primarily by which of the following?
TLS Online TPP Program

#Question id: 12220

#Unit 7. System Physiology – Animal

A female patient has unexplained severe hypernatremia (plasma Na+ = 167 mmol/L) and complains of frequent urination and large urine volumes. A urine specimen reveals that the Na+ concentration is 15mmol/L (very low) and the osmolarity is 155 mOsm/L (very low). Laboratory tests reveal: plasma renin activity = 3 ng angiotensin I/ml/hr (normal = 1.0), plasma antidiuretic hormone (ADH) = 30 pg/ml (normal = 3 pg/ml), and plasma aldosterone = 20 ng/dL (normal = 6 ng/dL). Which of the following is the most likely reason for her hypernatremia?
TLS Online TPP Program

#Question id: 12221

#Unit 7. System Physiology – Animal

Juvenile (type I) diabetes mellitus is often diagnosed because of polyuria (high urine flow) and polydipsia (frequent drinking) that occur because of which of the following?
TLS Online TPP Program

#Question id: 12222

#Unit 7. System Physiology – Animal

In acidosis, most of the hydrogen ions secreted by the proximal tubule are associated with which of the following processes?