How many different nucleotide bases are used in nucleic acids in ...

[saliriagwu]

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.

[eliasc0401]

Answer to Question 1

D

Answer to Question 2

C

[saliriagwu]

Both answers were spot on, thank you once again

[eliasc0401]

Great! Please up vote