Toluene, ethylbenzene and xylene must be kept to ________levels in drinking and recreational waters due to their toxicity

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#Question id: 4390

#Unit 3. Fundamental Processes

Epigenetics marks refer to modifications to DNA and proteins that in turn regulate gene expression. Which statement is true regarding these specific types of modifications?

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#Question id: 18886

#Unit 13. Methods in Biology

What type of microscopy allows for the visualization of internal components within live, unstained specimens?

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#Question id: 11993

#Unit 10. Ecological Principles

Which of the following statements about light in aquatic environments is correct? 

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#Question id: 346

#Unit 1. Molecules and their Interaction Relevant to Biology

The partial negative charge in a molecule of water occurs because ________.

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#Question id: 3004

#Unit 2. Cellular Organization

Bacterium was inoculated into a rich medium. If at the end of 5 hours the total number of cells is 1024, then the number of elapsed generations and the generation time respectively is