An elderly patient complains of muscle weakness and lethargy. A urine specimen reveals a Na+ concentration of 600 mmol/L and an osmolarity of 1200 mOsm/L. Additional laboratory tests provide the following information: plasma Na+ concentration = 167 mmol/L, plasma renin activity = 4 ng angiotensin I/ml/hr (normal = 1), plasma antidiuretic hormone (ADH) = 60 pg/ml (normal = 3 pg/ml), and plasma aldosterone = 15 ng/dL (normal = 6 ng/dL). Which of the following is the most likely reason for this patient’s hypernatremia?

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#Question id: 8922

#Unit 9. Diversity of Life Forms

Which statement is most consistent with the hypothesis that the Cambrian explosion was caused by the rise of predator-prey relationships?

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#Question id: 11042

#Unit 7. System Physiology – Animal

A decrease in which of the following tends to increase pulse pressure?

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#Question id: 19799

#Unit 12. Applied Biology

Resistance to cry proteins may be due to _________binding of the toxin to midgut epithelium

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#Question id: 31077

#Unit 2. Cellular Organization

Which of the following ubiquitin ligase protein  recognized the N-terminus of a geminin protein destruction box that leads to degradation by proteosome in late anaphase? 

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#Question id: 5076

#Unit 5. Developmental Biology

Homeotic genes are responsible for: