Mutations can be caused by which of the following?

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#Question id: 3628

#Unit 8. Inheritance Biology

Two mutant plants, both bearing white flowers, were crossed. All F1 plants had red colored flowers. Which one of the following conclusions is correct?

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#Question id: 4385

#Unit 3. Fundamental Processes

The nuclear-receptor superfamily consists of several proteins that bind to consensus sequences of DNA response elements. Which of the following is NOT considered a member of this superfamily?

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#Question id: 24162

#Unit 1. Molecules and their Interaction Relevant to Biology

Black-and-white camera film, in the old days of film photography, was very sensitive to blue light but not to red light. Blue skies would often show very little detail, because the film couldn’t record all that it was seeing. To compensate, photographers would put a red filter on the lens, darkening the sky enough that the film could record its fluffy clouds.

This paragraph best supports the statement that

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#Question id: 20411

#Unit 3. Fundamental Processes

In intron mutations are expected to be selectively neutral except

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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?