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Author Question: How many different nucleotide bases are used in nucleic acids in life on Earth (consider both DNA ... (Read 191 times)

saliriagwu

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on: Jul 27, 2018
How many different nucleotide bases are used in nucleic acids in life on Earth (consider both DNA and RNA)?
 
  A) 25
  B) 4
  C) 20
  D) 5

Question 2

When an atom absorbs a photon containing energy, any of the following can happen except which?
 
  A) The atom becomes excited.
  B) The atom is ionized.
  C) An electron moves from an upper energy level to a lower one.
  D) An electron moves from a lower energy level to an upper one.


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eliasc0401

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

C


saliriagwu

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


eliasc0401

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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