Biology 8.1 Quiz

cell

basic unit of all forms of life

cell theory

fundamental concept of biology that states that all living things are composed of cells; that cells are the basic units of structure and function in living things; and that new cells are produced from existing cells

cell membrane

thin, flexible barrier around a cell; regulates what enters and leaves the cell

nucleus

in cells, the structure that contains the cell's genetic material in the form of DNA

eukaryote

organism whose cells contain a nucleus

prokaryote

unicellular organism that lacks a nucleus

what invention allowed us to discover cells?

microscope

how do you find the power of magnification on a microscope?

multiply the power of the eyepiece by the power of the objective

what are some of the major differences between light microscopes and electron microscopes?

light microscopes use light to see, can be used to see as small as 1 millionth of a meter; electron microscopes beams of electrons focused by magnetic fields (2 types are transmission and scanning), can be used to scan as small as 1 billionth of a meter of size

what is cell theory?

1. all living things are made up of cells

2. cells are the basic units of structure and function in living things

3. new cells are produced from existing cells

what are the major differences between eukaryotic and prokaryotic cells?

Prokaryotic cells have a simple structure, do not contain membrane-bound organelles, and lacks a nucleus; Eukaryotic cells have a more complex structure, contain membrane-bound organelles, and have a nucleus