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arsen [322]
4 years ago
11

Which of the following describes the difference between nitrogen-14 and nitrogen-15?

Biology
1 answer:
Snowcat [4.5K]4 years ago
7 0

Some of these can easily be eliminated by knowing that both nitrogen 14 and nitrogen 15 are isotopes ( same element, with the same amount of protons, but with different numbers of neutrons) of nitrogen. So if the only difference between nitrogen 14, 15 , and regular nitrogen is the amount of neutrons...how many protons and electrons should both nitrogen 14 and 15 have? After thinking, you should be able to eliminate A, B,and C.
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3 years ago
How did the discovery of three categories of petite mutations in yeast lead researchers to postulate extranuclear inheritance of
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<h3><u>Answer;</u></h3>

Whereas segregational petites exhibited Mendelian inheritance, both neutral and suppressive petites followed non-Mendelian patterns that were consistent with the involvement of an extranuclear agent

<h3><u>Explanation</u>;</h3>
  • Mutations that yield defective mitochondria are expected to make cells grow much more slowly. These mutants were called petites to describe their small colonies compared to large wild type colonies.
  • Petite mutants could not grow when cells had an energy source requiring only metabolic activity of mitochondria - needed sugar as well which is part of glycolytic pathway.
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