The main cause of the increase in the amount of CO2 in Earth's atmosphere over the past 150 years is

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#Question id: 2279

#Unit 2. Cellular Organization

Mitochondrial enzymes for oxidative metabolism are

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#Question id: 315

#Unit 1. Molecules and their Interaction Relevant to Biology

Which is not a proper way to form a hydrogen bond? (The symbol ʺRʺ represents a general organic group. The hydrogen bonding is represented by dashed lines.)

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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: 15760

#Unit 5. Developmental Biology

Why Stem cells are sometimes referred to as “undifferentiated”?

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#Question id: 2993

#Unit 2. Cellular Organization

During meiosis, a defect occurs in a cell that results in the failure of spindle microtubules binding at the kinetochores. Which of the following statements describes the most likely result of such a defect?