cells and microscopy Flashcards
1
Q
what is the cell theory
A
- all cells are composed of one or more cells
- the cell is the basic structural and functional unit of all living organisms
- cells arise only from the division of preexisting cells
2
Q
what do all cells have
A
plasma membrane, DNA, ribosomes and cytoplasm
3
Q
what do DNA and RNA do
A
carry hereditary information and direct the manufacture of cellular molecules
4
Q
why do cells need energy
A
to respond to changes in their environment, reproduce and pass on hereditary information
5
Q
what do prokaryotic cells lack
A
a nucleus and internal compartmentalization
6
Q
what do unicellular organisms do
A
carry out all activities necessary for life
7
Q
what do multicellular organisms do
A
activities of life are divided among a number of specialized cells
8
Q
what does light microscopes do
A
use light to illuminate the specimen
9
Q
what does electron microscopes do
A
use electrons to illuminate the specimen (transmission and scanning)
