Bio- What Is Life?

What Is Science

• A body of knowledge
  • A way of gaining knowledge/explaining the natural world

Scientific Inquiry

process by which scientists ask
questions, seek answers and communicate their
findings to the world

Steps Of Scientific Inquiry

• exploration

• investigation

• communication

hypothesis

a tentative explanation
that makes predictions
that can be tested

Theory

a general explanation
of natural phenomena
supported by many
experiments and
observations

Biology

Study of Life

“bio” life

“ology” the study of

Characteristics of life

Cellular, replicate, evolve, store and process information, process energy and matter, respond to the environment

Cells

Basic unit of life

a membrane bound system, contains genetic information, carries out the process necessary for life.

Cell Theory

All organisms are made of cells

all cells come from pre-existing cells

reproduction

Living systems must have the capacity to reproduce new copies of themselves.

Theory of evolution

change in allele frequencies in a population over time

critical point- a population evolves not an individual

tree of life

cell theory+theory of evolution

Life stores and processes information

living systems contain heritable information that is passed down through generations

Central Dogma

DNA → transcription→ RNA →translation → protein

Life Processes energy and matter

Living organisms need energy to power cellular processes and matter to build and maintain cells

energy

Comes from sunlight or chemical compounds

matter

Comes from the enviorment

metabolism

Metabolism includes all of the cell’s chemical
reactions, including reactions that build and break
down molecules. Those reactions involve both
matter and energy.

Life responds to the environment

Living organisms detect changes in their internal or external environment and will respond to them

organisms must respond to the changes in their environment in order to survive

biological scale and Hierarchy

cell, organism, population, community, ecosystem