Chapter 18 Classification

Biologists use a classification system to group organisms in part because organisms

• are going extinct

• are very numerous and diverse

• are too much alike

• share too many derived characters

The study of organisms requires the use of

• a. only large, general categories of organisms.

• b. only small, specific categories of organisms.

• c. both large and small categories of organisms.

• d. no categories of organisms.

Scientists assign each kind of organism a universally accepted name in the system known as

• traditional classification

• the three domains

• binomial nomenclature

• cladistics

For many species, there are often regional differences in their

• common names

• scientific names

• taxa

• binomial nomenclature

In taxonomy, a group at any level of organization is referred to as a

• cladogram

• binomial

• taxon

• system

Scientists have identified and named

• all living species

• all living and extinct species

• all extinct species

• a fraction of all species

In the scientific version of a species name, which of the terms is capitalized?

• the first term only

• the second term only

• both the first and second terms

• neither the first nor the second term

Based on their names, you know that the baboons Papio annubis and Papio cynocephalus do NOT belong to the same

• class

• family

• genus

• species

How do binomial, or two-part, names compare with early versions of scientific names?

• They are longer

• They are shorter

• They are completely descriptive

• They are in English

The second part of a scientific name is unique to each

• order in its class

• family in its order

• genus in its family

• species in its genus