In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by ________.

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#Question id: 12095

#Unit 10. Ecological Principles

It is now thought that the atmosphere of the primitive Earth was composed largely of carbon dioxide, nitrogen, and water vapor. The composition of certain iron-containing minerals suggests that the carbon dioxide began to be replaced by oxygen about 2 billion years ago.   Which of the following is the best explanation for the change in atmospheric composition?

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#Question id: 3657

#Unit 3. Fundamental Processes

Mutations in excision repair genes or a translesion DNA polymerase cause:

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#Question id: 12329

#Unit 10. Ecological Principles

In a tide pool, 15 species of invertebrates were reduced to eight after one species was removed. The species removed was likely a(n)

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#Question id: 11523

#Unit 2. Cellular Organization

In the given figure, which of the following complex represents high energy intermediate?

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#Question id: 14486

#Unit 13. Methods in Biology

There are two bags, one of which contains 5 red and 7 white balls and the other 3 red and 12 white balls. A ball is to be drawn from one or other of the two bags, find the chance of drawing a red ball.