Level 2 NCEA Cell Structure

Mind Map by CChristine, updated more than 1 year ago
Created by CChristine over 5 years ago


Copyright limited Christine Lee 04.09.14 may be used for educational purposes only Based on ESA Study Guide Level 2 Biology

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Level 2 NCEA Cell Structure
1 Cells Structure
1.1 Cell membrane
1.1.1 separates cell & environment
1.1.2 2 layers of lipid molecules (phospholipid bilayer) bilayer is fluid -> allows proteins to move
1.1.3 controls entry/exit of substances in & out of the cell
1.1.4 semi-permeable- allows passage of only certain substances oxygen, carbon dioxide, glucose, freely diffuse
1.2 cytoplasm
1.2.1 jelly_like fluid water, ions in solution, small molecules & proteins
1.2.2 where most of chemical reactions occure
1.2.3 supports organelles
1.3 nucleus
1.3.1 largest organelle in cell- double membrane membrane connected to ER
1.3.2 many large pores- pass of materials in and out
1.3.3 contains genetic material
1.3.4 controls cell activities and processes
1.4 Mitochondria
1.4.1 oval shape- increases S.A: Vol ratio so more oxygen can diffuse into mitochondria faster
1.4.2 found in large numbers in cells that need a lot of E e.g. sperm, muscle, liver cells lining kidney tubules- very active- reabsorb substances by active transport
1.4.3 inner membrane forms folds: cristae increases surface area for enzymes to work on
1.4.4 aerobic respiration
1.4.5 outer membrane controls exit/entry of materials
1.4.6 matrix: fluid filled space inside mitochondria
1.5 Endoplasmic Reticulum
1.5.1 network of membranes running through cytoplasm
1.5.2 rough endoplasmic reticulum ribosomes attached- protein production common in cells that make and secrete proteins e.g. digestive cells to produce enzymes
1.5.3 smooth endoplasmic reticulum production of lipids common in cells that produce steroid/hormones e.g. oestrogen, progesterone, testosterone
1.5.4 functions as a transport system carries materials within cell from nucleus -> outside of the cell
1.6 ribosomes
1.6.1 site of protein synthesis
1.6.2 made in nucleus
1.6.3 attached to ER making proteins for use inside the cell
1.6.4 free in cytoplasm proteins for outside the cell secreted or used in cell membrane
1.6.5 made of 2 subunits to form the protein-synthesising unit
1.7 Golgi body
1.7.1 consists of stack of membrane sacs- cisternae
1.7.2 after being synthesised most molecules pass through golgi body
1.7.3 transports and stores lipids from ER
1.7.4 modifies chemicals transported to it from ER and secretes
1.8 vacuoles
1.8.1 fluid filled spaces surrounded by a membrane
1.8.2 storage toxic substances- later excreted from cells water, sugars, proteins, salts animal cells- food vacuoles organic compounds, amino acids, inorganic ions pigments e.g. for petals
1.9 Lysosomes
1.9.1 small vacuoles containing digestive enzymes membrane prevents enzymes from digesting cells itself
1.9.2 releases enzymes digest/destroy worn-out organelles within the cell digest material taken into the cell e.g. break down ovum membrane to allow sperm head entry
1.10.1 Cell wall made of many tiny cellulose fibres made of thousands of cellulose molecules fibres at right angles provide strength provides support to the cell allows it to be turgid without bursting
1.10.2 Chloroplasts found in photosynthetic cells plant leaves and stems site of photosynthesis contains grana grana=piles of flattened membranes called thylakoids contains chlorophyll chlorophyll converts light E -> ATP have increased surface area for light absorption increases rate of photosynthesis fluid=stroma contains enzymes involved in final stages of photosynthesis have large starch granules form a temporary store for products of photo synthesis
1.11 cilia and flagella
1.11.1 cilia hair like short found in large numbers create currents move chemicals about/over suface of cell e.g. in the trachea move the cell
1.11.2 projecting from surface of some animal/plant cells
1.11.3 flagella whip-like 'tails' usually singular move the cell e.g. sperm
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