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: 5653

#Unit 5. Developmental Biology

Why is meiosis required for germ cell formation, yet is never used by somatic cells?

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#Question id: 9218

#Unit 9. Diversity of Life Forms

What strategy was used to rescue Illinois prairie chickens from a recent extinction vortex?

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#Question id: 645

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is the correct combination of marker enzymes used to identify different organelles during subcellular fractionation of eukaryotic tissue?

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#Question id: 2955

#Unit 2. Cellular Organization

Cyclin is to MPF as ............ is to cyclin-dependent kinases.

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#Question id: 3256

#Unit 11. Evolution and Behavior

There are three alleles, A1, A2, and A3, whose frequencies are equal abundance. According the Hardy-Weinberg equilibrium