REVIEW & REHEARSE: 10 THE ORIGIN and DIVERSIFICATION of LIFE on EARTH

!ques1! <i>Check Your Knowledge</i>

Question 10.12

In a set of classic experiments performed in the early 1950s, Urey and Miller subjected an experimental system composed of H2, CH4 (methane), and NH3 (ammonia) to electrical sparks. A few days later, they found _________ in their system.

  • a) amino acids
  • b) DNA
  • c) microspheres
  • d) cells
  • e) RNA

Question 10.13

What kind of molecule is thought to be the most likely to have been the first genetic material?

  • a) protein
  • b) DNA
  • c) carbohydrate
  • d) RNA
  • e) microsphere

Question 10.14

According to the biological species concept, species are natural populations of organisms that have the potential to interbreed and are ________ isolated from other such populations.

  • a) behaviorally
  • b) prezygotically
  • c) postzygotically
  • d) geographically
  • e) reproductively

Question 10.15

The classification rank that includes genera but not orders is:

  • a) species.
  • b) domain.
  • c) class.
  • d) kingdom.
  • e) family.