Bellringer 12/7/15

1. What is the smallest unit that can perform all the processes necessary for life?

2. A group of cells with the same function makes up a __________.

3. What are the four levels of organization?

Answers to bellringer....

1. A cell is the smallest unit that can perform all life processes.

2. A group of cells with the same function makes up a tissue.

3. The four levels of organization of living things arecelltissueorganorgan system

Cellular processes….

Diffusion the movement of particles

from regions of higher density to regions of lower density

Osmosis the diffusion of water

through a semipermeable membrane

Cellular processes continued…

endocytosis process by which a cell

membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell

INSIDE

exocytosis process in which a cell

releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane

OUTSIDE

Four levels of organization cell - the smallest unit that can carry out life

processes tissue - group of similar cells that perform a

common function organ - collection of tissues that carry out a

specialized function of the body organ system - group of organs that work together

to perform body functions

Chromosome - one of the structures in the nucleus that are made up of DNA and protein

Mitosis - process of cell division that forms two new nuclei

Cell Cycle - the life cycle of a cell

Mitosis and the Cell CycleCytokinesis - division of the cytoplasm of a cell

How does mitosis ensure that a new cell is just like its parent cell?

HOMEWORK: (answers only) Due 12/9/15 pages 70-71 #s 1-17 & 23-25 pages 92-93 #s 3-14 & #s 19-21