Cells as the Basis of Life
What are prokaryotic cells?
Prokaryotic cells are the simplest cells which contain no membrane bound organelles
Define Unicellular
Organism made up of only one cell
Define Homeostasis
Maintenance of a constant internal environment, meditated by feedback systems.
What does chlorophyll do to green pigment?
Reflects it
Define ventilation
The exchange of air between the lungs and the environment
What's the function of the cell membrane?
Cell membranes are selectively permeable. Permeability refers to the ability of a membrane to allow things to cross it. To be selectively means that somethings can cross the membrane while others cannot.
Define multicellular
Organism made up of many cells that display different sizes shapes and functions
Define Synaptic Cleft
The space between the elements in a synapse.
Raw Materials in photosynthesis?
Carbon dioxide and Water.
Explain why the 'bunch of grapes' appearance of alveoli assists gas exchange.
Grape like appearance allow for more surface area.
Describe proteins in the cell membrane
Proteins: perform a variety of functions including transportation and signal receiving
- Its cells must have the same DNA
- Its cells must be connected and must communicate and cooperate to function as a single organism
- It must have different cells that are specialised and responsible for specific functions
- Its cells must be dependent on each other for survival
What is Resting Potential ?
Polarised state of neutron membrane due to a sodium pump resulting in the inside of the membrane being negative related to the outside.
Where does the Calvin Cycle occur?
The Stroma
Describe what happens between capillaries and aveoli with regards to gas exchange.
Aveoli hold the fresh air, the capillaries are where oxygen and carbon dioxide diffuse across. This is where gas exchange occurs.
What are the three things that determine permeability?
1. Size
2. Electric charge
3. Lipid solubility
Name some unicellular organisms
Bacteria, cyanobacteria, amoeba, Paramecium, algae, yeast
What is a Thermoconformer ?
Any organism whose body temperature changes according to the external temperature.
A process where energy in electrons in released.
Electron Transport Chain.
What is an operculum
external plate of aquatic animals used to cover their gills
what happens to diffusion when the temperatures are higher?
Higher temperatures will causes molecules to move more which will increase the rate of diffusion
What is it meant by a colonial life form?
they are unicells or multicellular organisms living together independently or with a fundamental organisation that has some division of labour and some cells carrying out specialised functions
What is Myelin sheath?
A fatty sheath surrounding some nerve fibres formed by Schwann cells.
Where is energy is stored in photosynthetic organisms?
Chemical Bonds
If the alveoli's were stretched out what would the surface area be?
Roughly the size of a tennis court