Staying Alive
The maintenance of a constant inernal state in a changing environment
What is homeostais
the process by which plants algae and some bacteria make their own food
What is photosynthesis?
before a cell can divide this must be copied
What is DNA?
the movement of particles without energy
what is passive transport?
the opposite direction of passive transport
what is low to high?
How does the body respond to the cold weather?
What is shiver?
the process by which cells use oxygen to produce energy from food
What is cellular respiration?
Why do cells undergo mitosis?
to replace dead or damaged cells
cell membranes are __________ because they allow only certain particles cross into or out of the cell
What is semi-permeable?
the movement of particles against the concentration gradient
What is Active Transport?
regulates what goes in and out of the cell
What is the cell membrane?
Nearly all __________ around us is made by photosynthesis
What is oxygen?
these cells are constantly dividing
What are skin cells?
the movement of particles from high area of concentration to a low area of concentration
What is diffusion?
the process in which a cell uses energy to surround a particle and enclose it in a vesicle to bring the particle INTO the cell.
What is endocytosis?
What does a tree do to maintain homeostasis during the winter months?
loses leaves
all living things need ________ to produce energy for cell processes.
What is food?
in this process equal number of chromosomes are separated and the nucleus splits to form two identical nuclei
What is mitosis?
the diffusion of WATER through a semi-permeable membrane
What is Osmosis?
the process when particles are enclosed in a vesicle and released OUT of the cell
What is exocytosis?
the ability to obtain and use energy
make new cells
exchange materials
eliminate wastes
What are the four things that cells do to maintain homeostasis?
photosynthesis takes place inside these organelles
What are chloroplasts?
in order to divide up theDNA evenly between two new cells the DNA needs to be packaged. These packages are called________
What are chromosomes?
when tea is added to a cup of water the molecules in tea will eventually spread out. The tea is moving from a ______ are of concentration to a ______ area of concentration.
What is high to low?
Molecules move in and out of a cell by diffusion. You have more molecules on the outside of the cell than inside. Where will the molecules move as a result of diffusion?
into the cell