Why is having a scientific name for each species of organism important?

• To prevent existing named organisms from having their names changed as they become extinct

• To keep the classification system from being altered as new organisms are discovered

• To allow organisms to be placed into many different classification levels at the same time

• To standardize the naming and organization of organisms to avoid confusion

Taxonomy is a scientific field involving what?

• The study of relationships between organisms

• The study of microorganisms and their metabolic pathways

• The classification of organisms based on similarities and differences into a hierarchical system

• The examination of genes and heredity to show how pieces of genetic material are passed onto offspring

Members of the Kingdom Plantae are characterized by

—

• Having segmented bodies with jointed appendages

• Cell walls of cellulose

• Mostly unicellular organisms

• Heterotrophy

Scientists find a new organism that is composed of many cells, gets its nutrition from decaying organisms,

and has cell walls. To what kingdom would the new organism belong?

• Animalia

• Protista

• Fungi

• Eubacteria

Unlike bacteria, organisms in the

group Protista–

• Have cell walls

• Have no nucleus

• Have a nucleus and membrane-bound organelles

• Are simple and photosynthetic

Unlike protists, organisms in the group Animalia —

• Have cells with no cell walls and have an organ system

• Have cells with a cell wall and are heterotrophic

• Are all mobile and autotrophic

• Are complex and photosynthetic

Spiders, crabs, pill bugs, centipedes, and millipedes are examples of the many types of arthropods. Which of these arthropods would be most closely related?

• Arthropods of the same family

• Arthropods of the same class

• Arthropods of the same genus

• Arthropods of the same species

Which of the following lists the taxa

from broadest to most specific?

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

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

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

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

The unknown species is most closely related to which of the four known species?

• Species W

• Species X

• Species Y

• Species Z

Large numbers of helpful bacteria normally grow and reproduce in a person’s intestine. Which of the following is one way that these bacteria promote health?

• Preventing pathogens from entering the body

• Breaking down toxins in the digestive tract

• Competing against pathogens for colonization sites

• Bringing essential minerals into the body