Chapter 25

Question 1

All organisms must be able to

Answer 1

Reproduce and process energy

Question 2

Ribozyme

Answer 2

RNA molecule that functions as an enzyme

Question 3

Radiometric Dating

Answer 3

Method for determining absolute age of fossils based on half life of radioactive isotopes

Question 4

Half life

Answer 4

Amount of time it takes for 50% of sample of radioactive isotope to decay

Question 5

Stromatolites

Answer 5

Layered rock that results in activities of prokaryotes that bind thin films of sediment together

Question 6

Endosymbiosis

Answer 6

Relationship between 2 species when one organisms lives inside the cell/cells of another organism (how eukaryotes originated)

Question 7

Cambrian explosion

Answer 7

Brief time in geologic history when many present day phyla of animals first appeared in fossil record

Question 8

Adaptive radiation

Answer 8

Period of evolutionary change where groups of organisms form many new species who’s adaptations allow them to fill different ecological roles in their communities

Question 9

Heterochrony

Answer 9

Evolutionary change in the timing or rate of an organisms development

Question 10

Paedomorphosis

Answer 10

Retention of juvenile features of ancestor in adult organism

Question 11

Homeotic gene

Answer 11

Any of the master regulatory genes that control placement and spatial organization of body parts in plant animal fungi by controlling developmental fate of group cells