Unit 1: Biology Review

Biology 2: Bio in the Real World

Zoology

The study of animals

Biology

The study of living things

Unicellular

An organism that is made of one cell, such as a bacterium

Multicellular

An organism that is made of many cells, such as a dog

Growth

An increase in size or number of cells

Development

Changes as an organism matures

Sexual

Reproduction using sperm and egg

Asexual

Reproduction without sperm or egg

Metabolism

The process by which organisms obtain and use energy

Cellular respiration

Process that living things do to turn sugar into ATP (energy)

Homeostasis

Maintaining a stable internal environment

Cell

Basic unit of structure and function in organisms, such as a neuron

Tissue

Group of cells with a specific job, such as epithelial tissue

Organ

Structure made of tissues with a specific function, such as the liver

Organ system

Group of organs working together, such as the digestive system

Organism

A single living thing, such as a frog

Population

A group of the same species living in the same area, such as a flock of geese

Community

All living things in an area, such as coral reef organisms

Ecosystem

All living and nonliving things in an area, such as a forest with trees, animals, soil, and water

Biome

Large region with similar climate and ecosystems, such as a temperate deciduous forest

Biosphere

Anywhere on Earth where life exists

Autotroph

An organism that makes its own food, also known as a producer

Heterotroph

An organism that must eat or absorb food, also known as a consumer

Prokaryote

A unicellular organism with no nucleus

Eukaryote

An organism with cells that have a nucleus

Symbiosis

A close relationship between two species in which one always benefits

Mutualism

A symbiotic relationship in which both organisms benefit

Commensalism

A symbiotic relationship in which one benefits and the other is unaffected

Parasitism

A symbiotic relationship in which one benefits and the other is harmed