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MCAT Biology Passage 7: Cell Genome and Reproduction
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Before Mendel, the mechanism by which progeny inherited traits from their parents was poorly, if at all, understood. However, for roughly 150 years following Mendel, research into cellular division and meiosis broadly advanced the understanding of genetics and the role of alleles in variations of characteristics within a population. More recently, the field of epigenetics has greatly expanded the understanding of gene expression and its role in developmental biology.
For each of the following, identify the most likely mechanism that best explains the specific data presented.
MCAT Biology Passage 7: Cell Genome and Reproduction
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5 Questions

1. A Gram positive obligate anaerobic organism, but which can survive in the presence of molecular oxygen.
2. The isolation of a naturally occurring single-celled organism with 70S ribosomes but lacking a cell wall.
3. A cell that disassembles its own nucleus and subdivides its cytosol and organelles into smaller-sized membrane-bound nonfunctional subunits.
4. A cell that can terminally differentiate into any of a number of final cell forms.
5. An organism that can express a significant glycoprotein capsule one day but fails to produce it the next under identical environmental conditions.

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