Search This Blog

IB HL Bio Notes For Sale

Hi! If you are interested in buying scanned PDF copies of my handwritten HL Bio notes, please find the links below. Previews are available! Clicking on the links simple redirect you to a description of the notes + a preview. :)

Alternatively check this link out:

Please email me for more details if you wish. :)
michelle.lim205@gmail.com

Wednesday 11 April 2012

Cell Structure

a) Levels of Organisation
2.1 describe the levels of organisation within organisms: organelles, cells, tissues, organs and systems

 b) Cell Structure
2.2 recognise cell structures, including the nucleus, cytoplasm, cell membrane, cell wall, chloroplast and vacuole

 2.3 describe the functions of the nucleus, cytoplasm, cell membrane, cell wall, chloroplast and vacuole

 2.4 describe the differences between plant and animal cells
Animal cell

  1. A cell membrane is like a sieve, it controls what goes in and out of the cell. 
  2. The cytoplasm is where the chemical reactions take place, the mitochondria in the cytoplasm is where respiration takes place to release energy. The cytoplasm also contains enzymes that control the chemical reactions. 
  3. The nucleus is like the 'brain' of the cell, it controls the cell, telling it what to do. It also contains DNA which is important when the cell reproduces. 


10.1_plant_cell_V2
Plant cell

Plant cells have extra features:

  1. They have a cell wall, this is made of cellulose. It gives the cell shape and structure and provides support. It also means the cell can't burst, it becomes turgid when it is full of water. (The cell walls are actually impermeable to water, which is why they have small gaps in them called plasmodesmata which allow water to enter via osmosis..)
  2. They have chloroplasts which contain chlorophyll-the green pigment that allows it to absorb light energy and convert it to chemical energy during photosynthesis. Plants are autotrophs-they can make their own food. 
  3. Plant cells have a permanent vacuole that contains cell sap, it provides support. It is also basically a storage and removes waste, and provides/maintains the cell structure. 

Feature
Animal Cell
Plant Cell
Nucleus
Yes
Yes
Cytoplasm
Yes
Yes
Cell Membrane
Yes
Yes
Mitochondria
Yes
Labels:

2 comments:

  1. Anonymous21 December 2012 at 17:48

    Great blogs, realy helped me with my biology revision!

    ReplyDelete
  2. Unknown22 March 2013 at 02:36

    I just read this thing for my biology exams tomorrow and so far I like what I see,please keep writing these things so I can maybe get 90+!!!!!!!!!!!!!!!!!!!hooray!!!!!!!. Party here I come.

    ReplyDelete

Please tick a box showing your reaction, and any feedback is appreciated. :)

Note: This blog will no longer be updated as I finished IGCSEs in 2012. Sorry! :( If you are interested in buying IB notes though, please contact me. :)

Subscribe to: Post Comments (Atom)