5 characteristics of all living things
1. have a lifespan
2.grow, reproduce and are able to repair themselves
3.can sense and respond to changes in their environment
5. produce waste
What is the basic unit of structure of all living things?
What is the cell theory?
1. all living things are composed of one or more cells
2. cell is the basic unit of life
3.all cells come from pre-existing cells
What do animal cells have that plant cells don't?
centriole and flagellum
What do plant cells have that animal cells don't?
cell wall and chloroplast
What is an organelle?
a structure within the cytoplasm of a cell that performs a specific function
shape of animal cell versus plant cell
animal irregular - plant regular
vacuoles in animal versus plant cells
animal many and small - plant few and large
Which parts of a cell are visible under a microscope?
cell membrane, cytoplasm, nucleus, pseudopod, contractile vacuole, food vacuole
What do most cells include?
cell membrane, cytoplasm, nucleus, mitochondria and vacuoles
How do materials enter or exit a cell?
diffusion: moving from an area of high concentration to and area of low concentration
What is in the nucleus?
nucleoplasm, chromosomes with DNA and nucleolus
What is facilitated diffusion?
difusion at a faster rate using proteins
What is osmosis?
movement of a solvent from and area of high concentration to an area of low concentration through a selectively permeable membrane.
What is the difference between diffusion and osmosis?
Diffusion lets materials pass, osmosis only liquids
What is asexual reproduction?
producing offspring from only one parent - offspring is identical to parent
What is sexual reproduction?
producing offspring by the fusion of sex cells ( egg and sperm) - the offspring will have half of the genetic information from each parent (offsping will look different.)
What are sex organs called on animals/
What do cells take in?
oxygen, water and nutrients
What do cells get rid of ?
wastes and carbon dioxide
What are gametes?
how is a zygote formed?
by fusing gametes ( egg and sperm)
why do offspring have vriability?
different genetic combinations from both parents