Over the past 12 weeks, a 75-year-old man with a moderate aortic stenosis has developed shortness of breath and chest pains during exertion. He appears pale. Test of his stool for blood is positive. Laboratory studies show the following: hemoglobin 7.2 g/dL, and mean corpuscular volume 75. A blood smear shows microcytic, hypochromic erythrocytes. Which of the following is the most likely diagnosis?

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#Question id: 5058

#5. Developmental Biology

 In the formation of vertebrate eye, optic vesicle and head ectoderm are-

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#Question id: 5838

#8. Inheritance Biology

In the Holliday model describing recombination

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#Question id: 4593

#11. Evolution and Behavior

Which of Darwin's ideas had the strongest connection to his reading of Malthus's essay on human population growth?

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#Question id: 11065

#7. System Physiology – Animal

A liquid-ventilated lung compared to a gas-ventilated lung

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#Question id: 4963

#11. Evolution and Behavior

Which free-living cells were the earliest contributors to the formation of Earthʹs oxidizing atmosphere?