Lesson 2.5: Classification of Prokaryotes

Question 1

What are prokaryotes

Answer 1

lack nucleus and other membrane-bound organelles

Question 2

describe the two groups of prokaryotes

Answer 2

bacteria- most abundant domain

archaea- single-cell; extreme conditions

Question 3

What is the two domain system and explain how it was debunked?

Answer 3

the two-domain system consisting of archaea and bacteria was proposed in 1970 through rRNA it was revealed that archaea are more related to eukaryotes than to bacteria

Question 4

What are the three domains of life

Answer 4

Bacteria
Eukarya
Archaea

Question 5

How are the domains further classified

Answer 5

genotype: DNA sequences to reveal evolutionary relationships

Phenotype: observable characteristics: cell shape, size, motility, and metabolic pathways

Ecology: environment and ecological niche

Question 6

_____ are the fundamental units of biological diversity

Answer 6

species

Question 7

most widely accepted species concept

Answer 7

polyphenetic species concept

Question 8

Levels of classification

Answer 8

Kingdoms: not universally adopted
Phyla
Classes
Orders
Families
Genera
Species

Question 9

Committee responsible for maintaning and updating ICNB

Answer 9

International Committee on Systematics of Prokaryotes ICSP

Question 10

Additional points for nomenclature of prokaryotes

Answer 10

Separate systems: independent naming codes
Not static: periodically revised