biology chapter 1

Different levels of life’s organization

atoms

molecules

macromolecules

organelles

cells

tissue

organs

organ systems

organisms

Cellular organization

all living things are composed of one or more cells

energy utilization

all living cells use energy

homeostasis

all living things maintain relatively constant internal conditions so that their complex processes can be better coordinated

growth, development, and reproduction

all living things grow and reproduce

heredity

all organisms posses a genetic system that is based on the replication and duplication of s long molecule called DNA

DNA

deoxyribonucleic acid, genome contains entire set of DNA instructions

What are the different life forms

Bacteria, Archaea, Eukarya

Bacteria

live in regulated environments

Archaea

live in extreme environments

Eukaryotes

posses true nucleus and membrane-bound organelles, usually bigger organisms and of more complex structure

Prokaryotes

unicellular organisms that lack membrane-bound organelles. Usually small and generally simple structure.

Different eukaryotic forms

protists, plants, fungi, and animals

atomic number

number on top, shows position on periodic table, reps how many protons for that element.

three main domains?

archaea, bacteria, protists

what is the scientific method?

method researchers follow to observe the world and how it works

steps if the scientific method?

observation, hypothesis formation, prediction, experimentation, conclusion

Darwins theory of evolution

natural selection, survival of the fittest

living systems…

depend on information transactions