Cells (3/3.1) Flashcards
The basic units of structure and function in living things
Cell-
-States that all living things are composed of cells
Cell Theory
- a small, nonliving particle that invades and then reproduces inside a living cell
Virus
is the process in which cells break down food and release the energy stored.
Cellular respiration-
is the energy currency of life, it is a high energy molecule found in every cell and its job is to store and supply the cell with needed energy
ATP-adenosine triphosphate, or ATP for short,
Widely accepted explanation of the relationship between cells and living things.
Cell theory
Cell size is LIMITED. true or false?
True
As cell size ____, it takes longer for material to ___ from the cell membrane to the interior of the cell.
increases; diffuse
Surface area-to-volume ratio: as a cell increases in size, the volume ____faster than surface area.
increases 10x
A ____is a membrane-covered structure that contains all of the materials necessary for life
cell
A change that affects the activity of an organism is called a
stimulus (plural: stimuli)
A stimulus can be anything else that causes an organism to respond in some way. Give other examples
gravity, light, sound, a chemical, hunger
The maintenance of a stable internal environment is called
homeostasis.
Function: provides support and protection to the cell membrane Made of porous cellulose so it does not regulate what enters and leaves, fungal walls (chitin)
Cell Wall
Functions: separates the inside of the cell from its environment, provides support and protection Controls what substances enter and leave the cell
Cell Membrane