Biology Test Ch. 1 Flashcards
order
classify organisms
organ system
group of organs that work together to carry out a task
ex. respiratory system
tissues
groups of similar cells
cells
- smallest living units
- made up of organelles
organelles
tiny organ, small enough to fit into cell
ex. nucleus - brain of cell
molecules
made up of atoms
atoms
- smallest part of element
- has chemical properties of that element
entropy
- amount of disorder in a system
- unorganized amount of entropy goes up with age
- ultimate stage of entropy = death
Metabolism
- the sum of ALL chemical reactions going on in body
- breakdown and synthesis of molecules
- making energy available, building needed parts
ex. breaking down breakfast
Responsiveness
how organisms react to their environment
ex: mouse running from eagle
Motility
ability to move
ex:crawl, fly, swim, slither
Reproduction
production of offspring
Asexual
- single parent,
- genetically identical offspring
Sexual
- 2 parents
- unique offspring
Development
progressive changes resulting increased size
Heredity
-involves passing of “genes” from parent to offspring
-controls “pcb” traits
physical, chemical, biological
genes are made of DNA but make…
protiens**
Adaptations
- genetic mutations gives advantage
- a change in the gene
Natural Selection
evolutionary mechanism identified by Darwin and Wallace
individuals with “GOOD” variations have…
an advantage in a competitive environment
Nature “SELECTS” the most “FIT” organisms to…
become the parents of the next generation. FIT=sueded
Life formed…
3.8 bill years ago
Earth is how old?
4.5 billion yrs old
When was oxygen first created?
2.5 billion years ago