Biology chapter 1

biology

the study of life

organism

living thing

Homeostasis

the ability of living things to maintain a stable internal environment

metabolism

all chemical reactions occurring within the cells of an organism

cells

the smallest units of an organism that is considered alive

unicellular

organisms with one cell

multicellular

organisms with many cells

levels of organization in multicellular organisms

cells-tissues-organs-organ systems-organisms-ecosystems

tissues

a group of specialized cells that perform a specific function

organ

a group of specialized tissue that perform a specific function

organ systems

a group of organs that execute a function of the organism

stimulus

any change in the environment can be internal or external

internal

any thing inside your body

external

something you do on purpose

homeostasis

the ability for living things to keep a stable internal environment

dynamic equilibrium

the body taking action whenever balance is disturbed to stay balanced

metabolism

the intake of energy to fuel task and the sum of chemical reactions

regulation

activities that help maintain an organism’s homeostasis

negative feedback loop

when a parameter increases, mechanisms are triggered to reduce it to normal

reproduction

passing on genetic information to another generation of organisms

photosynthesis

the process in which green plants and other organisms transform light energy into chemical energy

asexual reproduction

single individual produces an identical offspring

sexual reproduction

cells from two different parents join together to produce the first cell of a new organism

what is DNA

the genetic code that determines the traits of all organisms

development

the process where cells divide again and again, change in shape and structure

evolution

when an organism changes over time due to the environment and time

viruses

particles made up of proteins, nucleic acids, and maybe lipids

species

any group of organisms that are capable of mating and producing fertile offspring

domains

three primary groups with all diversity of life

archaea

specialist bacteria

eukaryota

everything with nucleated cells like humans

bacteria

classic bacteria