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
Was there oxygen when earth was first created?
no
FIRST photosynthesis occurred in…
bacteria….NOT plants