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bio lab test study
bio
17
Biology
Undergraduate 1
10/06/2011

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Term

what is Diffusions

 

 

 

 

 

 

Definition

is the random movement of molecules from higher concentration to a low concentration 

Term
2 factors that affect diffusion 
Definition
2 factors are temperature, suface area and size of molecule 
Term
molecules which use diffusion
Definition

gases such as oxygen and carbondixode 

 

Term
what is osmosis 
Definition

is the passage of water molecules from a region of there high concentration to a region of their low concentration though a partially semi permeable membrane it is the form of diffusion which only water molecule move 

Term
what does hypertonic mean
Definition

solutions have more solute than the inside of the cell and lead to crenation (shrivel up)

Term
what is hypotonic 
Definition

solutions have less solute than inside the cell and lysis ( bursting)

Term
what is isotonic 
Definition

have an equal amount of solute on the inside and outside of the cell and this doesn’t affect the cell.

Term
what is active transport
Definition

is the movement of molecules from a lower to higher concentration using ATP as energy, requires a protein carrier.

Term
facilated diffusion what is it 
Definition

is the transport of molecules across the plasma membrane from a higher concentration to a lower concentration. Via a protein carrier  

 

Term
how to test for lipids ( fats)
Definition

The regents for a lipid test is put a paper towel on a table and put something on it and see if they’re a stain 

Term

how to you find if a substance has protien in it

what colour will it turn if its has protien in it

Definition

The regents used for proteins is biuret regent a positive test for protein will turn purple 

Term
how to test for glucose ( sugar)
Definition

The regents used to test for sugars are glucose use benedicts solution than put test tube into a hot water bath 

Term

how do you test for carbohydrates 

what colour will it turn if its positive

Definition

The regents used to test for carbohydrates are 1 percent starch and 5 drops of iodine  the colour it will turn if the control is positive is brown 

Term
what colour do gram positive cells turn 
Definition

the cells that retain the primary stain will appear blue or purple

Term
what colour will gram negative cells be
Definition

Cells that stain with the counterstain will appear pink or red

Term
what is a eletron microscope 
Definition

uses a beam of electrons magnified and focused on a photographic plate by means of electronic.

 

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