Cells - Exam 2 Flashcards
1
Q
biology
A
scientific study of life
2
Q
properties of life
A
- reproduction
- growth & development
- energy use
- order
- response to environment
- evolution
- cells
3
Q
prokaryotic cell
A
- small
- simple
- no membrane (enclosed organelles)
- first appeared 3.5 billion years ago
- DNA isn’t contained within any cellular structure
- unicellular
- ex: bacteria and archaea
- DNA located in nucleoid
4
Q
eukaryotic cell
A
- 10-100x larger than prokaryotic cell
- more structurally complex
- membrane enclosed organelles
- evolved 2.1 billion years ago
- housed in membrane enclosed nucleus
- unicellular and multicellular
- ex: plants, fungi, and protists
- DNA located in nucleus
5
Q
3 domain system
A
all of life is classified into 1 of 3 basic groups
6
Q
prokaryotes
A
- 2 domains
- archaea
- bacteria
7
Q
eukaryotes
A
- eukarya (divided into kingdoms)
- Kingdom Plantae
- Kingdom Fungi
- Kingdom Animalia
8
Q
cell theory
A
1) all organisms are composed of one or more cells
2) cells are smallest living things
3) cells only arrive by division of a preexisting cell
9
Q
rate of diffusion is affected by…
A
- surface area available
- temperature
- concentration gradient of diffusing substance
- distance
10
Q
a cell is…
A
the lowest level of organism that is still living
