Stem cells are defined by two capacities:

(1) the ability to regenerate or “self-renew” and

(2) the ability to differentiate into all diverse cell types. Embryonic stem cells have the capacity to generate every specialized cell type in an organism, in other words,

TLS Online TPP Program

#Question id: 4947

#Unit 11. Evolution and Behavior

The first genes on Earth were probably

TLS Online TPP Program

#Question id: 4948

#Unit 11. Evolution and Behavior

RNA molecules can both carry genetic information and be catalytic. This supports the proposal that 

TLS Online TPP Program

#Question id: 4949

#Unit 11. Evolution and Behavior

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

TLS Online TPP Program

#Question id: 4956

#Unit 11. Evolution and Behavior

Which measurement would help determine absolute dates by radiometric means?

TLS Online TPP Program

#Question id: 4957

#Unit 11. Evolution and Behavior

How many half-lives should have elapsed if 6.25% of the parent isotope remains in a fossil at the time of analysis?

TLS Online TPP Program

#Question id: 4958

#Unit 11. Evolution and Behavior

What is true of the fossil record of mammalian origins?