Classification

Fish, snails, zebras, and fruit flies are all organisms, and they look very different from each other. All organisms can be classified into six kingdoms: Eubacteria, Archaea, Protist, Fungus, Plant, and Animal. Although the organisms listed above look very different, they are all members of the same kingdom. Which kingdom do they belong to, and what is a characteristic shared by all organisms in this kingdom?

• Animal; All animals are multicellular.

• Eubacteria; All eubacteria have eukaryotic cells.

• Animal; All animals live in a marine environment.

• Protist; All protists can move around in their environment.

Which of the following is NOT a reason why scientists classify organisms?

• so that scientists all over the world can talk about organisms with a common language

• so that scientists can organize all the different types of organisms to study them better

• so that scientists can more easily identify new organisms that are discovered

• so that scientists can tell the order in which the organisms were discovered

How do scientists classify the millions of organisms on Earth?

• by placing them into a hierarchical system based on shared traits and characteristics

• by placing them into an alphabetical system based on the discovering scientist

• by placing them into a cyclical system based on population size and location

• by placing them into a chronological system based on date of discovery

When scientists studied the bacteria Salmonella, they found that it was composed of which of the following?

• a single nucleus

• a single molecule

• a single cell

• a single atom

The most basic form of classification for organisms is by placing them into one of three domains. Which parts of an organism are observed in order to determine its domain?

• tissues

• molecules

• organs

• cells

Which of the following methods would be LEAST helpful to a scientist in determining the relatedness of two types of animals?

• comparing the diets of the two animals

• comparing the DNA of the two animals

• comparing the physical characteristics of the two animals

• comparing the development patterns of the two animals

Which of the following identifies the levels of classification in correct order?

• domain, kingdom, phylum, class, order, family, genus, species

• genus, species, domain, kingdom, phylum, class, order, family

• domain, kingdom, genus, species, phylum, class, order, family

• genus, species, phylum, class, order, family, domain, kingdom

Dogs and cats are animals that have many similar body structures but they do not mate with each other. How are these two animals classified?

• The same kingdom and the same species.

• The same kingdom, but different species.

• Different kingdoms, but the same species.

• Different kingdoms and different species.

Which statement is true of a multicellular organism?

• Each cell in a multicellular organism performs all special functions.

• All cells in a multicellular organism perform the same special functions.

• Different types of cells in a multicellular organism perform special functions.

• Different organelles of a multicellular organism’s cells perform all special functions.

Look at the classification scheme below.

The classification scheme indicates that the cat is most closely related to which of the following animals?

• dolphin

• songbird

• wolf

• lynx