#Question id: 5238
#Unit 5. Developmental Biology
all tissue types possess a unique stem cell niche, and despite many differences among the niche architecture of different tissues, several common principles of stem cell regulation can be applied to all environments. These principles involve extracellular mechanisms leading to intracellular changes that regulate stem cell behavior.
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Column A |
Column B |
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I. Extracellular regulatory mechanisms |
i. Regulation by endocrine, paracrine, or juxtacrine mechanisms |
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II. Intracellular regulatory mechanisms |
ii. Regulation by a network of transcription factors |
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iii. Epigenetic regulation |
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iv. Regulation by cell-to-cell and cell-to-matrix adhesions |
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v. Regulation by cytoplasmic determinants |
Match the following regulatory mechanism (column A) with the factors that regulate stem cell behavior (column B).
#Question id: 4708
#Unit 11. Evolution and Behavior
The following questions refer to the figure below, which shows an outcrop of sedimentary rock whose strata are labeled A-D. If x indicates the fossils of two closely related species, neither of which is extinct, then their remains may be found in how many of these strata?
#Question id: 12261
#Unit 10. Ecological Principles
#Question id: 18875
#Unit 9. Diversity of Life Forms
#Question id: 16775
#Unit 13. Methods in Biology
If the mean and the mode are given as 35 and 30. Find the Median.