Biology Exam

Front 1

sessile

Back 1

organism permanently attached to one place

Front 2

symmetry

Back 2

balance or similarity in body structures of organisms

Front 3

anterior

Back 3

head end of an animal with bilateral symmetry

Front 4

posterior

Back 4

tail end of an animal with bilateral symmetry

Front 5

dorsal

Back 5

backside of an animal with bilateral symmetry

Front 6

ventral

Back 6

underside or belly of an animal with bilateral symmetry

Front 7

exoskeleton

Back 7

hard or tough outer covering of many invertebrates that provides support, protects body tissues, prevents water loss, and protects the organism from predation

Front 8

endoskeleton

Back 8

internal skeleton that protects internal organs, provides support for the organism's body, and can provide an internal brace for muscles to pull against

Front 9

invertebrate

Back 9

animal without a backbone; between 95 and 99 percent of animal species are invertebrates

Front 10

metamorphosis

Back 10

in most insects, the series of changes from a larval form to an adult form

Front 11

molting

Back 11

in arthropods, the periodic shedding of the protective exoskeleton so their bodies can continue to grow

Front 12

coelom

Back 12

fluid-filled body cavity completely surrounded by mesoderm

Front 13

ectotherm

Back 13

animal that cannot regulate its body temperature through its metabolism and obtains its body heat from the external environment

Front 14

endotherm

Back 14

organism that generates its body heat internally by its own metabolism

Front 15

parasite

Back 15

an organism who benefits at the expense of another organism

Front 16

hermaphrodite

Back 16

animal that produces both sperm and egg in its body, generally at different times

Front 17

notochord

Back 17

flexible, rodlike structure extending the length of the chordate body, enabling the body to bend and make side-to-side movements

Front 18

amniote egg

Back 18

egg that provides a complete environment for the developing embryo with a yolk sac for nutrition, protective internal membranes and fluid, and a protective outer shell