weekly announcements quiz wednesday on chapter 2
TRANSCRIPT
Weekly Announcements
• Quiz Wednesday on Chapter 2
9/23/13 Do Now
• Describe Homeostasis in your own words
9/23/13 Agenda
• Do Now
• Review HW that is due today
• Finish Notebook Checks
• Review and Hand Back Labs
• HW: Prepare for tomorrow’s competition review of chapter 2. (pairs compete)
Reminder of Cell Theory
• All living things are made up of cells.
• Cells are the smallest working units of all living things.
• All cells come from pre-existing cells through cell division.
• Question: Who discovered the cell?
So What’s a Cell?
•A cell is the smallest unit that is capable of performing life functions. •A cell is the basic unit of life.
9/24/13 Do Now
Clear your desks of all materials and prepare for review competition!
HW: Study for Chapter 2 Quiz
9/25/13 Do Now
• Clear your desks after writing down your homework. Today is the Chapter 2 Quiz!
• HW: Read pages 33-34 and answer “Check Your Understanding” on page 35
Chapter 3: Questions We Will Answer
1. What are some things cells do to achieve homeostasis?
2. Are all cells the same? (Explain)
3. Cells have certain “parts” or organelles that function within the cell to allow it to perform its duties and maintain homeostasis. What do you think has to be done inside of a cell to maintain homeostasis?
9/26/13 Do Now
• Who discovered the cell? What was his experiment and what did he see?
• HW: Read pages 36-37
Cell Structure & Function
http://koning.ecsu.ctstateu.edu/cell/cell.html
Examples of Cells
Amoeba Proteus
Plant Stem
Red Blood Cell
Nerve Cell
Bacteria
Two Types of Cells
•Prokaryotic- primitive, disorganized
•Eukaryotic- organized, complicated
Prokaryotic
• Do not have structures surrounded by membranes
• Few internal structures
• One-celled organisms, Bacteria
http://library.thinkquest.org/C004535/prokaryotic_cells.html
Eukaryotic• Contain organelles surrounded by membranes• Most living organisms
Plant Animal
http://library.thinkquest.org/C004535/eukaryotic_cells.html
“Typical” Animal Cell
http://web.jjay.cuny.edu/~acarpi/NSC/images/cell.gif
Cell Parts
Organelles
Cell Membrane
• Outer membrane of cell that controls movement in and out of the cell
• Double layer • Phospho-lipid bi-layer
http://library.thinkquest.org/12413/structures.html
Cytoplasm
• Gel-like mixture
• Surrounded by cell membrane
• Contains hereditary material
Nuclear Membrane
• Surrounds nucleus• Made of two layers• Openings allow
material to enter and leave nucleus (RNA)
http://library.thinkquest.org/12413/structures.html
Nucleus
• Controls cell activities- brain of the cell
• Separated from cytoplasm by nuclear membrane
• Contains genetic material - DNA
Nucleolus
• Inside nucleus• Contains RNA to build
proteins
http://library.thinkquest.org/12413/structures.html
Chromosomes
• Found in nucleus• Made of DNA• Contain instructions
for traits & characteristics (blueprint)
http://library.thinkquest.org/12413/structures.html
Mitochondria
• Produces energy through chemical reactions – breaking down fats & carbohydrates
• Controls level of water and other materials in cell
• Recycles and decomposes proteins, fats, and carbohydrates
http://library.thinkquest.org/12413/structures.html
Vacuoles
• Membrane-bound sacs for storage, digestion, and waste removal
• Contains water solution
• Help plants maintain shape
http://library.thinkquest.org/12413/structures.html
9/27/13 Do Now
• What do the vacuoles do in the cell?
• HW: Read pages 38-40 and complete the questions in “Check Your Understanding” at the bottom of page 39.
Ribosomes
• Each cell contains thousands
• Make proteins• Found on ribosomes
& floating throughout the cell
http://library.thinkquest.org/12413/structures.html
Endoplasmic Reticulum• Moves materials around
in cell• Smooth type: lacks
ribosomes• Rough type (pictured):
ribosomes embedded in surface
http://library.thinkquest.org/12413/structures.html
Golgi Bodies
• Protein 'packaging plant'
• Move materials within the cell
• Move materials out of the cell
http://library.thinkquest.org/12413/structures.html
Lysosome• Breaks down proteins,
fats, and carbohydrates• Transports and
breaksdown undigested material to cell membrane for removal
• Cell breaks down if lysosome explodes
http://library.thinkquest.org/12413/structures.html
Plant Cells are Somewhat Different…
List some things you might think are different about plant cells
http://waynesword.palomar.edu/images/plant3.gif
“Typical” Plant Cell
Chloroplast
• Usually found in plant cells
• Contains green chlorophyll
• Where photosynthesis takes place
http://library.thinkquest.org/12413/structures.html
Cell Wall
• Most commonly found in plant cells & bacteria
• Supports & protects cells
• Made of cellulose
http://library.thinkquest.org/12413/structures.html