Introduction to Cells

to protect and support the cell

to perform different functions in each cell

to prevent water from passing through it

to prevent oxygen from entering the cell

mitochondrion

ribosome

nucleus

chloroplast

particle.

element.

carbohydrate.

compound.

contain water.

speed up chemical reactions.

contain genetic material.

help the cell maintain its shape.

osmosis

engulfing

active transport

facilitated diffusion

animals.

single-celled organisms.

bacteria.

multicellular organisms.

how well structures close together can be distinguished

how large an image can be

how many lenses a microscope uses

how much light is needed to see an image

to support the cell

to perform different functions in each cell

to control which substances enter and leave the cell

to form a hard outer covering for the cell

all look the same.

all have the same structure.

are often quite different from each other.

are the same size in every part of the organism.

collision

diffusion

active transport

concentration