Unit 1: characteristics of life

What do you need to have in order to be classified living?

The characteristics of life

What are the characteristics of life?

Living things are made of cells, have heredity (DNA), have Metabolism, Maintain homeostasis, grow and develop, reproduce, adapt and evolve, respond to the environment.

How many characteristics of Life are there?

8

to exchange gases in order to make energy

Respire

causes a reaction

Stimulus

All living organisms are composed of

Cells

Cells can be

Unicellular or Multicellular

Cells arise from preexisting cells

TRUE

Cells arise from spontaneous generation

FALSE

Something that is not living

Viruses

What do viruses need in order to reproduce

Organism ( HOST )

Viruses dont

grow and carry out respiration

Viruses are what macromolecule

Nucleic acid ( DNA OR RNA ) which is surrounded by a protein coat

What is the protein coat called that surrounds a nucleic acid?

CAPSID

Some viruses have a envelope which is like a

cell membrane

How do viruses take over a host?

They attach their receptors on the outside of cells to infect them

Nonliving ( was never alive )

Abiotic

Living ( once living )

Biotic

Basic unit of structure and function for living things.

Cell

red blood cell (erythrocyte), nerve cell (neuron); can have a suffix CYTE

Ex of cell

is a group of cells that work together to perform a specific function

Tissue

Blood, muscle, bone, linings of internal organs

EX Tissue

is a group of different types of tissues that work together to perform a function

Organ

Skin, eye, heart, tongue, kidney, liver, lung, stomach

EX of organ

is made up of different types of organs that work together to carry out a function

Organ system

Digestive, skeletal, circulatory, respiratory or urinary systems

EX of organ system

neuron

Cell ex

Nerve tissue

Tissue ex

Brain

Organ ex

Nervous system

System ex

A leaf is an example of a

Organ

Viruses dont have

cell organelles ( need them in order to carry out functions like reproduction )

Viruses have

A capsid, DNA or RNA, Sheath, Tail fibers

Viruses can do what with a host ONLY

Reprodue

Viruses and living cells both can

Reproduce ( viruses need host ), respond to environment, change over time

Viruses can not

Obtain and use energy, and grow and develop

Unicellular means

One cell

Multicellular means

Multiple cells

Can not make their own food

Heterotrophs

PRODUCERS ( can make their own food )

Autotrophs

Touching something hot and removing your hand

Responding to stimuli

maintaining internal stability while adjusting outside conditions

Homeostasis