Classification of living organisms

Question 1

How are species defined as?

Answer 1

A group of organisms that can reproduce to produce fertile offspring

Question 2

How are species classified?

Answer 2

Into groups by the features that they share

Question 3

What is the sequence of classification?

Answer 3

Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 4

What is the binomial system?

Answer 4

When the scientific name of an organism is made up of two parts:

genus (always given a capital letter)
species (starting with a lower case letter)

e.g. Homo sapiens

Question 5

What is the three-domain system?

Answer 5

Organisms are divided into archaea, bacteria and eukaryota.

Created by Carl Woese in 1990.

Question 6

What did DNA sequencing show?

Answer 6

The more similar the base sequences in the DNA of two species, the more closely related those two species are.

Question 7

What are characteristics of archaea domain?

Answer 7

• No nucleus
• Unused DNA
• Extremophiles

Question 8

What does having unused DNA mean?

Answer 8

They do not code for protein

Question 9

What are characteristics of bacteria domain?

Answer 9

• No nucleus
• No unused DNA
• Prokaryotic cells

Question 10

What are characteristics of eukaryota domain?

Answer 10

• Has nucleus
• Has unused DNA
• Contains fungi, plants, animals and protists