Question

All living organisms are made from different combinations of only ___________ amino acids. 15 20 25 30 double helix bi-helix twisted strand triple helix

Answer 1

yep its b have a nice day :)

Answer 2

All living organisms are made of only 20 different aminoacids- this is the correct answer! This means that the genetic code only codes for those 20 aminoacids (for example Glutamine and Lysine).
The 20 aminoacids that can form proteins are also called Proteinogenic amino acids.