Mature and certain differentiated e.g., parenchyma and often colenchyma cells undergo changes to become meristematic, this is called 

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#Question id: 10369

#6. System Physiology – Plant

Which type of the nitrogen-fixing bacteria are thought to maintain a low oxygen concentration (microaerobic conditions) through their high levels of respiration

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#Question id: 2063

#2. Cellular Organization

In what way do the membranes of a eukaryotic cell vary?

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#Question id: 3040

#2. Cellular Organization

Which of the following is electron source for lithotrophs microorganisms?

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#Question id: 1423

#4. Cell Communication and Cell Signaling

Which of the following is a characteristic of malignant tumors?

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#Question id: 5216

#11. Evolution and Behavior

Alu elements account for about 10% of the human genome. What does this mean?