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TLS Online TPP Program

#Question id: 7092

A gap gene mutation might cause which of the following defects in the embryonic body plan?

#Unit 5. Developmental Biology
  1. every other segment would be missing, resulting in T1, T3, A2, A4, etc. but no T2, A1, A3, and so on.
  2. segments A2 through A6 would be missing, but the rest of the pattern is essentially normal
  3. patterning within each segment would be abnormal, causing for example denticle belts to form across the entire segment
  4. the identity of one or more segments would be transformed to that of a different segment, such that the T3 leg would transformed to a T2 leg
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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?
TLS Online TPP Program

#Question id: 12223

#Unit 10. Ecological Principles

Evidence shows  that some grasses benefit from being  grazed. Which of the following  terms would  best describe this plant-herbivore interaction?
TLS Online TPP Program

#Question id: 12224

#Unit 10. Ecological Principles

Which of the following terms best describes the interaction between termites and the protozoans that feed in their gut?
TLS Online TPP Program

#Question id: 12225

#Unit 10. Ecological Principles

Which of the following interactions can correctly be labeled coevolution?