Which of following are unsolved problems in determining the origin of the building blocks of life?

a) Sufficient concentration of the ingredients of molecular building blocks

b) Unknown medium or substrate in or on which life could arise

c) The development of complexity of monomers and the subsequent formation of polymers

d) Selective chirality of RNA and DNA

Select one: a. a, b & c

b. a, c & d

c. b, c & d

d. All of the above

e. None of the above

Question 2 The number of possible combinations of experimental conditions imposes serious limitations on laboratory experiments designed to test the origins of life.

Select one: True False

Question 3 Viable human DNA is

Select one: a. left-handed b. right-handed