What is quantum tunnelling? What will be an ideal response? ...

[jon_i]

What is quantum tunnelling?
 
  What will be an ideal response?

Question 2

What was one reason that RNA was eventually replaced by DNA as the molecule of choice for storing genetic information?
 
  A) the bases that make up DNA became much more common
  B) DNA is far more stable than RNA
  C) DNA can catalyze its own replication
  D) the double helix of DNA is better able to correct errors in replication

[chem1s3]

Answer to Question 1

Quantum tunnelling is the name given to the mechanism by which small particles can overcome energy barriers. For example, an electron in a low energy level can occasionally tunnel through an energy barrier to a higher energy level. The effect arises because the absolute energy of an object is never precisely known because of the uncertainty principle. The uncertainty, in absolute terms, is very small, but for quantum particles, the relative uncertainty can be significant and occasionally allows a particle to jump over an energy barrier.

Answer to Question 2

D

[jon_i]

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[chem1s3]

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